----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：你做多長時間的眼保健操？A. Twice 兩次 ； B. Twice a day 一天兩次 ； C. For five minutes 五分鐘，表一段時間； D. At 9 a.m.在上午九點(diǎn)，具體的時間點(diǎn)。How long多長時間。故答案選C。
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