Complete the sentences with the Past Simple or Past Continuous, Active or Passive, form of the verbs in brackests.
5. While they ........... (build) the dam, a number of problems ................. (come) up.
5. While they ........... (build) the dam, a number of problems ................. (come) up.
Maciekil
While they were building the dam, a number of problems came up.
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