—How often do you exercise?
—＿＿＿
A. Two  B. Twice  C. Second
B
詞義辨析。two二，為基數(shù)詞；twice兩次；second第二，為序數(shù)詞。根據(jù)問句“你多久鍛煉一次？”，故選B。
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