【題目】Microwave ovens by millions of families today.
A.will use
B.are used
C.were used
D.is using

【答案】B
【解析】be used by被......使用。根據(jù)today今天，可知為一般現(xiàn)在時的被動語態(tài)，其謂語動詞形式為am/is/are+動詞過去分詞。根據(jù)ovens可知主語為復(fù)數(shù)，be動詞應(yīng)為are。故選B。

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