单项选择题

Can you tell me the difference ______ these three words

A．between
B．among
C．of
D．with
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单项选择题
His mother looks so young. ______ fact, she is ______.
A．At; the forty
B．In; the forties
C．As; forty
D．In; her forties
单项选择题
Only after ______ made hundreds of experiments ______ succeed in solving the problem.
A．they had; did they
B．had they; they did
C．they had; they did
D．had they; did they
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