单项选择题

A. Sooner or laterB. Once in a whileC. To be exactD. Be……

—According to my grandma, it is a good idea to eat chicken soup when you have a cold.
— （）, scientists agree with her

A. Sooner or later
B. Once in a while
C. To be exact
D. Believe it or not

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单项选择题以下属于英语学习策略中调控策略的是______。