问题
选择题
| To keep the air clean, this hospital forbids all the patients _____ in and around it. |
| A. to smoke B. smoking C. to be smoking D. smoked |
答案
答案：A
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| To keep the air clean, this hospital forbids all the patients _____ in and around it. |
| A. to smoke B. smoking C. to be smoking D. smoked |
答案：A