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單項(xiàng)選擇題

The medicine （） cool, clean and dry.

A.must   keep
B.must   be   kept
C.must   be   keep
D.must   be   in

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單項(xiàng)選擇題

“Must we start the experiment now?” “No, you （）.”

A.won’t
B.needn’t
C.can’t
D.may not

單項(xiàng)選擇題

He keeps（）at himself in the mirror.

A.to look
B.looking
C.look
D.looked

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