October 2019 1 31 Report
Las ondas electromagnéticas son:

A)Aquellas propiedades que se pueden sentir.

B)Son siempre transversales

C)No se propagan en medios materiales.

D)Pueden ser longitudinales y transversales
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1. My dad ________ smoking in the garage. has had had been 2. The printer ________ working well. had not been hadn't had not 3. Had the players _____ playing by the rules? been have be 4. She ________ expecting the worst. had 'd been had being 5. Had the teachers ________ before the strike? been work working been working 6. Our pool pump ________ running properly before the storm. had not have hadn't been hadn't being 7. My sister’s roommate was upset. She _____ been waiting for an hour. had has have 8. I just heard about the accident. ________ been working all night? Had the driver Had the driving Have the driver 9. We were shocked to see her. ________ been expecting her. We are We have We'd not
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1. Underline the correct alternatives to complete the rules. Past and Perfect tenses a. We use the past perfect simple / continuous for a completed action that happened before a specific time in the past. b. We use the past perfect simple o continuous to explain the cause of something in the past. we use the past perfect simple / continuous If the cause went on for some time. c. With state verbs (know, be, like, etc..) we use The past perfect simple / continuous with for or since to say how long an action had been in progress. d. With action verbs, we use the past perfect simple / continuous with for o since to say how long and action had been progress.
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Diferencias entre los derechos consagrados entre la constitución colombiana de 1991 y 1886
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Ayuda con este taller sobre los gases por favor, es urgente.
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