单项选择题

Seldom ______ any mistake during his past ten years of service there.

A．did he make
B．he makes
C．he made
D．he did make

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单项选择题

Must I hand in the paper right now No, you ______

A．mustn't
B．needn't
C．can't
D．shouldn't

单项选择题

What does the sentence Of course, these costs increase with time (Para. 1)mean

A．Costs of education will rise in the future.
B．Costs of living expenses will rise in the future.
C．Costs of living expenses never decrease in the past.
D．The longer you study in Australia, the more you will spend.

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