单项选择题

If you（）a moment, I'll ask the manager to talk with you about the recent developments of the factory.

A、 waited
B、 are waiting
C、 wait
D、 have waited

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单项选择题
Once the problem of the engine（）, all other problems will be readily solved.

A、 solve
B 、solved
C、 is solved
D、 will be solved
单项选择题
Beneath our feet（）that our life depends on for food, clothing and many other things.

A、 the earth lay
B、the earth lies
C、 lie the earth
D、 lies the earth
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