20 . They have madea rulein the room.A. this; not to smokeB. it; smokingC. it; to not s

问题补充：

20 . They have madea rulein the room.

A. this; not to smoke

B. it; smoking

C. it; to not smoke

D. it; not to smoke

答案：

A. this; not to smoke

B. it; smoking

C. it; to not smoke

(答案→)D. it; not to smoke

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