单项选择题

She was frightened and，（）what was wrong with him，at once rang up the doctor.

A.knowing not
B.not know
C.didn’t know
D.not knowing

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The price of vegetables is（）than before

A.much cheaper
B.still dearer
C.even higher
D.a lot more expensive

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Please （）up this chair for me.It’s really comfortable to sit on.

A.put
B.hand
C.fix
D.shut

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