单项选择题
22()
A.trying
B.try
C.trial
D.the trial
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单项选择题
21()
A.is saying
B.has said
C.says
D.has been saying
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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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