--- do your parents take exercise, Jim?

---Less than three times a week.

A. How long B. How much C. How soon D. How often

D 【解析】句意：-你的父母多長(zhǎng)時(shí)間鍛煉一次，Jim？-一周不到三次。How long 多長(zhǎng)時(shí)間，對(duì)一段時(shí)間提問(wèn)；How much多少，提問(wèn)數(shù)量，修飾不可數(shù)名詞；多少錢，提問(wèn)價(jià)格；How soon多久，多快，常和一般將來(lái)時(shí)態(tài)連用；How often多久一次，提問(wèn)頻率。根據(jù)下面的回答可知，這里問(wèn)的是鍛煉的頻率，故選D。
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