1936年，有16万观众通过媒体观看了第11届奥运会，这种媒体是（）。
A、电影
B、电视
C、电报
D、电话
参考答案：B
—I sent him the dictionary by mail this morning.
—You ______ that, for he's coming tomorrow morning.[ ]
A. needn't have done
B. didn't have to do
C. needn't do
D. mustn't do
