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. on the subject for half an hour, Liu Ying suddenly stopped. A. To be worked B.

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. on the subject for half an hour, Liu Ying suddenly stopped. A. To be worked B.

.

 ________ on the subject for half an hour, Liu Ying suddenly stopped.

A. To be worked                                B. To work                

C. Having worked                              D. Having been worked

试题答案

C