they __to enter the building by the back door:however,the front door was locked.A weren not supposed Bwould not be supposedCwere supposedDwould be supposed

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they __to enter the building by the back door:however,the front door was locked.
A weren not supposed
Bwould not be supposed
Cwere supposed
Dwould be supposed

A 他们不应该是是从后门进来的,但是,前门是锁的啊.