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
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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
单项选择题
Which of the following is NOT true
A．Teaching assistants are students themselves.
B．Every T.A. needs to pass the English test.
C．USC boasts a large number of overseas students.
D．In USC, specialized programs are provided for T.A. s.
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