题目内容

Some people viewed the findings with caution,noting that a cause-and-effectrelationship between passive smoking and cancer remains______.(1996.1.CET-6)

A. to be shown
B. to have shown
C. to have been shown
D. being shown

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Mrs.Brown is supposed______for Italy last week.(1990.1.CET-4)

A. to have left
B. to be leaving
C. to leave
D. to have been left

My sister's professor had her______her paper many times before allowing her to present to the committee.

A. rewritten
B. to rewrite
C. rewrite
D. rewriting

Professor Johnson is believed______some significant advance in his research in the past year.(1999.TEM-4)

A. having made
B. making
C. to have made
D. to make

There is more land in Australia than the government knows______.

A. what to do with
B. how to do
C. to do with
D. to do it