单项选择题

The professor is quite difficult pleased（）.

A．to please
B．to be pleased
C．for pleasing
D．pleasing

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单项选择题
The student asked her professor if he would have gone on the space ship he did know earlier（）.

A．if he knew
B．if he knows
C．he had known
D．had he known
单项选择题
Most of the older civilizations which flourished during the fifth century B.C.are died out（）.

A．they have died out
B．has died out
C．have died out
D．they had died out
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