单项选择题

_______, glasses can correct most sight defects in healthy eyes.

A．If well fitted when
B．Well fitted if
C．Well fitted when
D．When well fitted
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单项选择题
The sign said that unauthorized persons were prohibited _______ that restricted are
A． not enterB. from enteringC. to enterD. entering
单项选择题
It was difficult to _______ a date which was convenient for everyone.
A．decide
B．arrange
C．organize
D．provide
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