单项选择题

The students wish the summer vacation ______ now.

A．begins
B．has begun
C．began
D．had begun
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单项选择题
The committee ______ the problem for a whole afternoon but they have not yet reached an agreement.
A．has discussed
B．has been discussing
C．are discussing
D．have been discussing
单项选择题
Only when you have a good knowledge of grammar ______ write correctly.
A．you will
B．you can
C．can you
D．can't you
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