.From the classroom window we saw a huge snake the yard.A. crossing B. crossC. acrossD. h

发布时间：2020-08-16 12:42:50

 .From the classroom window we saw a huge snake      the yard.
A. crossing
B. cross
C. across
D. having crossed

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(答案→)A. crossing
B. cross
C. across
D. having crossed
解析：句意：从教室的窗户我们可以看到一条巨蛇在院子里正在爬过。短语： see sb /sth doing 看到某人或某物正在做某事，强调正在进行的动作。所以选A。
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