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。