单项选择题

Not a sound ______ while the professor was giving a speech.

A．the students utter
B．the students uttered
C．did the students uttered
D．did the students utter
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单项选择题
One should always remember that appearances can be ______ .
A．wrong
B．mistaken
C．incorrect
D．false
单项选择题
Those shirts are very expensive. Do you know ______
A．how much cost him
B．what do they cost
C．they cost how much
D．how much they cost
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