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
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
单项选择题
You'd better ______ the same things all the time. A) not to eat C) don't eat B) not eating D) not eat
You'd better ______ the same things all the time.
A) not to eat C) don't eat
B) not eating D) not eat
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