are building C) built,build D) had built;-找考题网

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The workers ______ a library for our university this month.
A) are building C) built
B) build D) had built

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______ this experiment is not difficult. A) Having done C) To do B) Done D) Being done

______ this experiment is not difficult.
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If Jane had taken more exercises in the past few years, she ______ so fat now. A) would be C) wouldn't have been B) wouldn't be D) would have been

If Jane had taken more exercises in the past few years, she ______ so fat now.
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