单项选择题

The secret agent kept looking back because he was afraid of ______.

A．followed
B．being followed
C．having followed
D．having been followed
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单项选择题
The weather ______ us from climbing the mountain.
A．discharged
B．disguised
C．disturbed
D．discouraged
单项选择题
______ sets man apart from the rest of the animal kingdom is his ability to speak.
A．Which
B．Whom
C．Who
D．What
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