单项选择题

.Mr. Smith, I should tell you this is the fifth time you me for my twin sister.

A．have mistaken
B．are mistaking
C．had mistaken
D．are mistaken
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单项选择题
Scientists are convincedthe positive effect of laughterphysical and mental health.
A．of; at
B．by; in
C． of, on
D．on; at
单项选择题
Now in China many young peopleimportant positions in the government.
A． seize
B．catch
C． grasp
D．hold
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