题目内容

The old man __ dead in the snow the next morning

A. Found
B. Was found
C. Was found
D. Had found

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光学投影类媒体包括幻灯、投影和电影媒体等。()

一些危险性、不易或不宜真实接触的必修教学内容与学习内容可以用创设模拟现实情境来满足教与学的需求。()

It’s time that we __ to take care of our own house

A. Begin
B. Will begin
C. Have begin
D. begin

彩色电视机的制式尽管不同,但是可以互换使用。()

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