单项选择题

The ______ problem of bringing a space ship back from the moon has been solved.

A. technical
B. technological
C. technique
D. technology
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单项选择题
He ______ have been nervous because he didn't go straight in.
A. ought to
B. must
C. should
D. had to
单项选择题
There is an increasing ______ to make movies describing violence.
A. strength
B. direction
C. tradition
D. trend
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