摘要： -----I knocked but nobody answered the door. -----They asleep then and didn’t hear you. A. must be B. should be C. must have been D. should have been
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—I knocked but nobody answered the door.
----They _____asleep then and didn’t hear you.
A.must be B.should be C.must have been D.should have been
查看习题详情和答案>>— I knocked but nobody answered the door.
— They _______ asleep then and didn’t hear you.
A. must be B. should be C. must have been D. should have been
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—I knocked but nobody answered the door.
----They _____asleep then and didn’t hear you.
| A．must be | B．should be | C．must have been | D．should have been |