单项选择题

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

A．to escape
B．to have escaped
C．to be escaped
D．to be escaping
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单项选择题
I am determined to get a ticket for the football games ______ it means standing in a queue all night.
A．provided
B．as if
C．even if
D．whatever
单项选择题
______ with steam engines, turbines have much higher efficiency.
A．Compared
B．While comparing
C．Compare
D．Comparing
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