问题
选择题
.
________ 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
答案
答案：C
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.
________ 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
答案：C