单项选择题

The sign said that unauthorized persons were prohibited _______ that restricted area.

A. not enter
B. from entering
C. to enter
D. entering
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单项选择题
The ___________ on his face told me that he was angry.
A. impression
B. sight
C. appearance
D. look
单项选择题
I felt that I was not yet__________ to travel abroad.
A. too strong
B. strong enough
C. so strong
D. enough strong
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