单项选择题

As you worked late yesterday, youhave come this morning.

A．maynt
B．cant
C．mustnt
D．neednt
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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
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
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