单项选择题

______, I should not have wasted my time trying to explain matters to you.

A．I had not realized what you intended
B．Had I not realized what you intended
C．I had realized what you intended
D．Had I realized what you intended
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单项选择题
If only ______ the violin in the middle of the night, she'd be an ideal guest.
A．played
B．would play
C．didn't play
D．wouldn't play
单项选择题
Michael Creuse, ______ help Whymper climbed the Matterhom, was one of the first of the professional guides.
A．who
B．whose
C．that
D．with whose
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