单项选择题

Professor Smith is said()another important discovery in chemistry.

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

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单项选择题
() a major disaster will get us to realize that we can’t go on destroying the rain forests of the world.

A. Anything but
B. But that
C. Nothing but
D. Everything but
单项选择题
The air-liner was supposed to take off at ten o’clock but()we had to wait until eleven.

A. in effect
B. for ever
C. on purpose
D. for result
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