The building of the lab ____ before the end of this term.

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The building of the lab ____ before the end of this term.
The building of the lab ____ before the end of this term.
A.must have completed B.must have been completed
C.must be completed D.must complete
还有一题：
If you ____ quiet,I’ll tell you what happened.
A.are B.will be
C.are to be D.be

第一题
lab被建所以要用被动排除D ab都有have肯定不靠谱就选C咯
第二题
后面有will 前面也要用will

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