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【单选题】

Let the old man _____ the bus first.
[ ]

A.
get on
B.
to get up
C.
to get on
D.
getting up
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参考解析:
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举一反三

【单选题】When I got home, my parents _____ for about an hour.[ ]

A.
has got back
B.
has gone back
C.
had come back
D.
had been back