24．It is by no means clear the president can do to end the strike．
(A)how
(B)which
(C)that
(D)what

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詳解 (共 1 筆)

#1204498
It是形式主语，从句中缺少do的宾语，名词性从句引导词在从句中充当成分，故选择what作为主语从句的引导词充当从句中谓语动词do的宾语。
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