It is by no means clear the president can do to end the strike.(·新课标全国)A. howB. whic

问题补充：

It is by no means clear the president can do to end the strike.(·新课标全国)

A. how

B. which

C. that

D. what

答案：

A. how

B. which

C. that

(答案→)D. what

解析：考查主语从句的连词。根据从句可以看出这里do后缺少宾语，而且该句子没有先行词，It在句中作形式主语，可以判定这是主语从句，主语从句中缺少宾语，因此排除that和how；而which在名词性从句中表选择而且有一定的选择范围，该题没有给出可供选择的范围，所以排除which，故选what。句意：总统能做什么来结束罢工根本不清楚。