单项选择题

______, he can quickly find out what's wrong with the machine.

A. Having been well trained
B. Having well trained
C. To be well trained

D. To have been well trained
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单项选择题
The result of their research shows that______.
A. dreams are easily remembered
B. dreams are likely to be frightening
C. everyone dreams every night
D. persons dream only one dream a night
单项选择题
The researchers were surprised to find that______.
A. people sleep soundly while they dream
B. dream memories are often incomplete
C. sleepers fidget while dreaming
D. dreamers can record their own dreams
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