单项选择题

（）arriving at the spot, the policemen at once helped the passengers to safety.

A. At
B. On
C. The moment
D. As

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单项选择题
The shop owner came up to see（）

A. what was happened
B. what was going on
C. what the matter was
D. what is the matter
单项选择题
You look （） in blue while red clothes are nice（）her.

A. well, for
B. well, to
C. good, at
D. good, on
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