问题
选择题
It is by no means clear ________ the president can do something to end the strike.
A．whether
B．which
C．that
D．what
答案
答案：A
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。