问题
选择题
It's no good ________ here this morning. Come again on Monday.
A.wait
B.waiting
C.having waited
D.to be waiting
答案
答案:B
选B 考查动词ing形式作主语。句意:今天上午在这里等是没用的,周一再来吧。在固定结构it's no good/use doing sth.中,it为形式主语,doing为真正的主语。