单项选择题
Having saved ______ money, Mary was able to buy her elder sister a watch.
A.few
B.a few
C.little
D.a little
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单项选择题
I wish ______ you the answer to your problems.
A.I can give
B.I could give
C.I give
D.I am giving
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单项选择题
Scientists ______that bacteria through microscopes for many years.
A.studied
B.have studied
C.had studied
D.have seen studied
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