单项选择题

I didn’t manage to work out the problem () the teacher had explained how.

A．until
B．unless
C．when
D．before

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单项选择题
—Where’s John, do you know—Oh, () to hospital.

A．he’s taken
B．he’ll be taken
C．he’s been taken
D．he’ll take
单项选择题
What will the weather in Arizona be like in the coming week()

A．Rainy.
B．Warm.
C．A bit col
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