. New technology ______ to make sure that the cars, taxis, buses and trains we use ______ the air.

A. is used; not to pollute       B. has used; is not polluted

C. is being used; do not pollute     D. has been used; to pollute

C


解析:

本題主要考查動詞的時態(tài)及語態(tài)的應用。第 1 空強調(diào)目前所正在進行的一種行為。由于主語是動作的承受者，應該使用現(xiàn)在進行時的被動語態(tài)；第 2 空強調(diào)一般經(jīng)常性的行為，應該用一般現(xiàn)在時。因此本題的正確答案選C。

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