While typing Helen has a habit of stopping once in a while to give her long and flowing h

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While typing, Helen has a habit of stopping once in a while to give her long and flowing hair a smooth.

A.occasionally

B.simultaneously

C.eventually

D.promptly

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗