题目内容

Experiments of this kind __________ in both the U.S. and Europe well before the Second World War.

A. have conducted
B. have been conducted
C. had conducted
D. had been conducted

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It is widely acknowledged that students should be _________ in terms of overall qualities.

A. supported
B. matched
C. evaluated
D. controlled

The only question is ________ we should go on with this work or not.

A. what
B. whether
C. that
D. why

I am sorry to say I failed to meet the deadline. With better equipment, I ________ the task on schedule.

A. would accomplish
B. might have accomplished
C. must have accomplished
D. could accomplish

What was it ________ made it hard for him to adapt to the new environment abroad?

A. where
B. why
C. that
D. what