21.By the end of this month,the power station for a whole year.
A.will run B.runs C.has run D.will have run
22.Since he is angry,we .
A.had better leaving him alone B.might as well leave him alone
C.should have left him alone D.would rather have left him alone
23.Here we found little snow,as most of it seemed blown the mountain.
A.to be;away B.that it was;of
C.to have been;off D.that it had been;down
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