单项选择题

  David, ______ for months to find a job in New York, finally took a position at a local travel agency.

A.struggling
B.struggled
C.having struggled
D.to struggle
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Another three weeks ______ necessary for us to finish the work.
A.are
B.was
C.is
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It is time that the government ______ measures to protect the rare birds and animals.
A.takes
B.took
C.has taken
D.taking
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