第四部分：情态动词填空 （每小题1分，满分6分）
63. —______ it be Li Ping who broke the glass?
—No. It ______ be Wu Dong who did it.
A. Can; must B. Must; need C. May; must D. Need; can
64. —Don’t forget to visit me when you come to Beijing.
—______.
A. I don’t B. I won’t C. I can’t D. I haven’t
