单项选择题

The current _________steady and strong, for the boat kept moving forward smoothly.

A．can't have been
B．needn't have been
C．must have been
D．should have been

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单项选择题

City _________complain that migrant workers have threatened to take already scarce urban jobs.

A．residents
B．customers
C．lodgers
D．travelers

单项选择题

I don't think you have heard of the story before you knew Peter,__________

A．don't I
B．haven't you
C．do I
D．have you

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