单项选择题

My younger sister ______ the Youth League ______ 1988.

A．has joined... in
B．has joined... since
C．joined... since
D．joined... in
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单项选择题
How many Monkey King Stamps have you collected
A．No one
B．None
C．Nothing
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He wrote the book in simple English ______ everybody might understand it.
A．so as to
B．in order to
C．in order that
D．so as that
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