问题描述:
it was not possible that she _____ go down ,step by stey down the unexpected stairs into the dark below.
a.should dare b.should dare to c.must dare d.must dare to
选b,为什么to不用省略
a.should dare b.should dare to c.must dare d.must dare to
选b,为什么to不用省略
问题解答:
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