单项选择题

Only when we had finished all the work（）that it was too late to take a bus home.

A. did we realize
B. will we realize
C. we did realize
D. we will realize

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The auto industry spends large amounts of money on marketing campaigns（）young adult customers.

A. attract
B. attracted
C. to attract
D. attracts
单项选择题
The first question we now discuss is（）we should go there so early tomorrow.

A. whether
B. where
C. what
D. whom
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