According to the engineer, there remain some tests _____ before the machine is put into operation.
A.carrying outB.carried outC.being carried outD.to be carried out
D

試題分析:表示將來的情況,所以用不定式,且carry out與其邏輯主語之間是被動關(guān)系,所以用不定式的被動式。        
點評:解題思路,① 解析句子結(jié)構(gòu),確定設(shè)空在句子中充當?shù)墓δ埽ㄈ鐮钫Z、定語或賓補);②找準相關(guān)動詞的邏輯主語,確定該動詞與邏輯主語是什么關(guān)系(主動還是被動);③ 搜索句子中相關(guān)的時間信息,確定非謂語動詞的恰當形式;④ 將該選項置入空中,看是否能夠做到字從意順,或是否能傳達有效信息、完成交際任務(wù)。
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