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----How long do you do eye exercises? ----____.

A. Twice B. Twice a day C. For five minutes D. At 9 a.m.

C 【解析】句意:你做多长时间的眼保健操?A. Twice 两次 ; B. Twice a day 一天两次 ; C. For five minutes 五分钟,表一段时间; D. At 9 a.m.在上午九点,具体的时间点。How long多长时间。故答案选C。
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