题目内容

If he () the problem well, he couldn't have solved it.

A. has not studied
B. shouldn't have studied
C. had not studied
D. were not to study

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Can machine perform the same tasks () ?

A. that man does
B. what man does
C. which man does
D. as man does

I can't help () about what he said once again.

A. thinking
B. thought
C. to think
D. have thought

Much () ,TV sets are being produced in larger and larger quantities every year.

A. being needed
B. needing
C. needed
D. having needed

轴的的键槽与孔内键槽加工方法是不一样的，通常是铣削加工

A. 对
B. 错