【題目】The experiment shows that proper amounts of physical exercise, if _______ regularly, can make a difference to our health.

A. being carried out B. carrying out

C. carried out D. to carry out

【答案】C

【解析】試題分析：考查狀語從句的省略。。當(dāng)狀語從句的主語與主句的主語一致，且狀語從句中有系動詞be的時候，可以把狀語從句的主語和be動詞一起省略。本句在if后面省略了proper amounts of exercise is；句意：這個實(shí)驗(yàn)顯示，如果適當(dāng)數(shù)量的鍛煉被經(jīng)常進(jìn)行，這樣的鍛煉能夠改善我們的健康狀態(tài)。故C正確。

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