单项选择题

Mr. Smith is supposed to______ for London the week before last.

A．to be leaving
B．to have been leaving
C．to have left
D．to have been left
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单项选择题
The parents went from house to house,______ whether anyone had seen the lost boy.
A．demanding
B．inquiring
C．requiring
D．searching
单项选择题
In 1950, she was the largest ship that______
A．was ever built
B．has ever built
C．has ever been built
D．had ever been built
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