单项选择题

Suppose there were a flood or an earthquake and the people could not be reached by trains or trucks.
______ packages of food could be dropped from planes, the people might starve.

A. Until
B. Before
C. Unless
D. If only
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单项选择题
______ for aches, pains and fever, aspirin is now the subject of multiple investigations of its role in treating many more serious complaints.
A. Long used
B. Being used long
C. Having been long used
D. It has long been used
单项选择题
You ______ such a long essay; our teacher only asked for 200 words, and you have written 300!
A. mustn’t have written
B. couldn’t have written
C. needn’t have written
D. might not as well have written
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