单项选择题

Roger and his wife was so lucky ______; he almost did not get out of the room when the roof col- lapsed.

A．to escape
B．to have escaped
C．to be escaped
D．to be escaping
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单项选择题
The medical treatment you have received from the hospital will ensure you a speedy ______ from your illness.
A．restoration
B．renewal
C．recovery
D．retreat
单项选择题
The buses, ______ were already full, were surrounded by an angry crowd.
A．most of which
B．both of which
C．few of them
D．those of which
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