It is by no means clear the president can do something to end the strike.
A. whether
B. which
C. that
D. what
网友回答
(答案→)A. whether
B. which
C. that
D. what
解析：A 考查主语从句。句意：一点也不清楚那位总统是否能采取措施来结束罢工。该从句不缺少任何成分，故排除B、D两项；根据题干中“by no means clear”可知设空处表示“是否”，故答案为A项。本题易误选D项，考生没注意到“the president can do something to end the strike”中的something，如将something去掉，则答案为D项。