It's very dangerous to use those machines that .A.are repairedB.are being repair
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It's very dangerous to use those machines that _______.
A.are repaired
B.are being repaired
C.is being repaired
D.is repaired
试题答案
B
从题意看“那些机器正在被修理，”所以用起来危险，A项是属于经常性的被动行为，C、D两项从句中动词 的数有误，故均不能选。