单项选择题

My key was missing, I ______ it in the office.
A) should have left C) must have left
B) could have left D) need have left
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单项选择题
So far every means ______ tried, but we still haven't found anything helpful to the case. A) has been C) are B) is D) have been
So far every means ______ tried, but we still haven't found anything helpful to the case.
A) has been C) are
B) is D) have been
单项选择题
It is requested that all the students ______ the assignments before Tuesday. A) handed in C) hand in B) to hand in D) handing in
It is requested that all the students ______ the assignments before Tuesday.
A) handed in C) hand in
B) to hand in D) handing in
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