ls_____ necessary to tell his father everying?A.that B.this C.it D.he
问题描述：
ls_____ necessary to tell his father everying?A.that B.this C.it D.he
答
it
答
C
固定句型 it 's +adj. + to do sth
答
it
结构; it is + 形容词+ to do sth. 所以用形式主语it
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