There was something wrong with the traffic signal. Our bus was held______for nearly half an hour.
A．on
B．back
C．out
D．up

A.
A．on
B．back
C．out
D．up


【参考答案】

D
由中心词held构成的四个动词短语意思各异。A项意为'继续，抓住'，B项意为'阻止，扣住'，C项的意思是'提......

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