surprised us most Tom should have left without a word.A.He; whyB.It; thatC.This;
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_______ surprised us most ______ Tom should have left without a word.
A.He; why
B.It; that
C.This; what
D.That; that
试题答案
B
it为形式主语,that从句为主语从句,说明it的真正内容。