2. 外语
  3. I ______ brushing my teeth twice a day.

I ______ brushing my teeth twice a day.

admin2013-06-19  47
问题 I ______ brushing my teeth twice a day.
选项 A、am in the habit of
B、make it a rule of
C、make a custom of
D、used to be
答案A
解析 动名词。B项结构使用错误，应为make it a rule to do，it是形式宾语，to do是真正宾语；D项used to do表示“过去常常做某事”。虽符合题意但时态使用有误。选择A。
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