单项选择题

The physicists propose that our attention ______ the use of special methods of thinking and acting.

A. would be directed towards
B. should be directed towards
C. is directed towards
D. directs towards
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单项选择题
______ that it was going to rain, he took a raincoat with him.
A. Seeing
B. Saw
C. Seen
D. To see
单项选择题
When he bent down to tie his shoelace, the belt of his trousers ______.
A. mined
B. cracked
C. broke
D. split
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