单项选择题

Whitman wrote Leaves of Grass as a tribute(赞颂) to the Civil War soldiers who (had laid) on the battlefields and (whom) he (had seen) (while serving) as an army nurse.

A. had laid
B. whom
C. had seen
D. while serving
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单项选择题
The president, with his wife and daughter, (are) returning (from) a brief vacation at Sun Valley in order (to attend) a press conference (this afternoon).
A. are
B. from
C. to attend
D. this afternoon
单项选择题
They went away for a fortnight on holiday.
A．a week
B．two weeks
C．a month
D．two months
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