题目：
Though a typhoon is on the way,people are still looking forward ____ the outdoor
concert by the pop singer.
A．to canceling
B．not to canceling
C．not to cancel
D．to not canceling
答案：
D
考查非谓语动词。look forward to中的to为介词，因此后面要用动词的现在分词形式；分词的否定式是在分词前面直接加not。
