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It is (was) +被强调部分+ that (who)+ 句子其他部分。
此结构强调的成分仅限于主语、宾语、表语和状语。
一、强调句型的强调部分必须是对 that / who 之后句子的某一成分表示强调，如果把“It is (was)...that ”去掉，该句应该意思完整，不缺任何句子成分.
It _____ Mike and Mary who helped the old man several days ago . A. was B. are C. were D. had been
此结构强调的成分仅限于主语、宾语、表语和状语。
一、强调句型的强调部分必须是对 that / who 之后句子的某一成分表示强调，如果把“It is (was)...that ”去掉，该句应该意思完整，不缺任何句子成分.
It _____ Mike and Mary who helped the old man several days ago . A. was B. are C. were D. had been
