Is___________necessary to call him before the performance？（　?。?/h1>

A． this

B． that

C． it

D． he

【考點(diǎn)】it作形式主語．

【答案】C

【解答】

【點(diǎn)評(píng)】

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發(fā)布：2024/7/25 8:0:9組卷：40引用：1難度：0.8

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A．As is required	B．It is required
C．It requires	D．What is required

Is___________necessary to call him before the performance？（ ?。?/h1>