Another drug that has helped improve people’s health is penicillin, _________ is _________ by many _________ one of the most important medicines.
A.which, considered, beingB.that, considering, been
C.that, to consider, beingD.which, considered, to be
D

試題分析:考察非限制性定語從句和固定搭配。本題第一空考察的是定語從句,先行詞是penicillin,which指代先行詞在句中作主語。第二空是固定搭配consider…to be…這是一個(gè)被動語態(tài)的形式。句意:另外一種能夠幫助改善人們健康的藥物與是盤尼西林,它被很多人認(rèn)為是最重要的藥物之一。故D正確。
點(diǎn)評:非限定性定語從句起補(bǔ)充說明作用,缺少也不會影響全句的理解,在非限定性定語從句的前面往往有逗號隔開,如若將非限定性定語從句放在句子中間,起前后都需要用逗號隔開。需要注意 which引導(dǎo)的非限定性定語從句是用來說明前面整個(gè)句子的情況或主句的某一部分。 在非限定性定語從句中,關(guān)系詞不能用that。
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