21.Another five weeks ____ necessary for us to finish the work.A.are B was C is D will have been

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21.Another five weeks ____ necessary for us to finish the work.A.are B was C is D will have been
21.Another five weeks ____ necessary for us to finish the work.A.are B was C is D will have been

21.Another five weeks ____ necessary for us to finish the work.A.are B was C is D will have been
A. are

看成是一个整体 单数C

21.Another five weeks __A__ necessary for us to finish the work. A. are B was C is D will have been