单项选择题
Several of the washing machines are out of order and they______
A．need repairing
B．need to repair
C．are needed to be repaired
D．require to repair
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单项选择题
Miss Smith came into the lab, ______by her students.
A．following
B．being followed
C．followed
D．having followed
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单项选择题
The Smiths______ the Summer Palace three times.
A．have gone to
B．have been in
C．have been to
D．have gone into
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