问题
选择题
When he was a boy, he used to go there and watch _____.
A．to repair bicycles
B．bicycles to be repaired
C．bicycles being repaired
D．repairing bicycles
答案
答案：C
用-ing形式一般式的被动语态作宾语补足语，强调自行车被修理的过程。
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