They ______ to enter the building by the back door; however, the back door was l

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问题 They ______ to enter the building by the back door; however, the back door was locked.

选项 A、weren’t supposed
B、wouldn’t be supposed
C、were supposed
D、would be supposed

答案 C

解析动词时态。be supposed to do sth．意为“应该，被期望”，指本来应该发生但是却没有发生的事情。

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