单项选择题

If she refuses to answer your phone calls, just ______ calling until she does answer.

A．insist in
B．persist in
C．to insist on
D．to persist on
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单项选择题
The girl will not become a nurse because she will faint at the ______ of blood.
A．vision
B．eyes
C．sight
D．view
单项选择题
He daren't come here any more, ______
A．dare he
B．does he
C．is he
D．will he
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