—MayIsmokehere?—Ifyou，chooseas

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—May I smoke here?
—If you ________， choose a seat in the smoking section.

A．should	B．could
C．must	D．may

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There is no doubt that _____ a goal, one needs not only knowledge but also good personalities.

A．realized	B．realizing
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A．which

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A．has been walking	B．had walked
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A．has served	B．had served
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