问题

. Smiths was busy writing a story, only ______ once in a while to smoke a cigarette.
A:to stop
B:to have stopped
C:being stopped
D:stopping;
B:to have stopped
C:being stopped
D:stopping;
正确答案是:
同类题型
When something _______me, I always go to my parents for help.—Me too, parents are always behind us.
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