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 more the relative humidity(温度) reading (rises), (the worst) the heat (affects) (us).
A．rises
B．the worst
C．affects
D．us
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
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