It ______John and Mary who helped us the other day.

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问题 It ______John and Mary who helped us the other day.

选项 A、were
B、are
C、was
D、had been

答案C

解析 本题考查强调句的用法。强调句的基本句式为:it be(is/was)that(who)…其中,be动词的形式只能是is或was,因为它的主语永远是it,而与被强调部分无关,因而正确答案为C)。
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