单项选择题
21()
A.two
B.three
C.several
D.a few
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单项选择题
Five minutes earlier, ______we could have caught the last train.
A.and
B.but
C.or
D.so
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单项选择题
I am feeling sick. I ______so much chocolate.
A.needn’t have eaten
B.couldn’t have eaten
C.mustn’t have eaten
D.shouldn’t have eaten
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