单项选择题

He demanded that the problem () at once.

A. would be solved
B. is to be solved
C. is solved
D. be solved

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单项选择题

Let's have a get—together on the weekend,______

A．shall we
B．will we
C．shan't we
D．won't we

单项选择题

Living in the central American desert has its problems, () obtaining water is not the least.

A. of which
B. for what
C. as
D. whose

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