The experiment shows that proper amounts of exercise, if _____ regularly, can improve our health.
A．being carried outB．carrying out C．carried out D．to carry out
C

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(dòng)詞be的時(shí)候，可以把狀語從句的主語和be動(dòng)詞一起省略。本句在if后面省略了proper amounts of exercise is；句意：這個(gè)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。
點(diǎn)評(píng)：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(dòng)詞be的時(shí)候，可以把狀語從句的主語和be動(dòng)詞一起省略。如果狀語從句中有it is的時(shí)候，it is 也可以省略。
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