【題目】I decided ________ at least once a week.
A.exercise
B.exercised
C.to exercise
D.exercising

【答案】C
【解析】句意:我覺(jué)定一周至少鍛煉一次。decide to do sth決定做某事,故此處用動(dòng)詞不定式to exercise,故選C。

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