第一节:单项填空(共15小题,每小题1分,满分15分)
从A、B、C、D四个选项中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。
21.--It snowed heavily last night and there must be a lot of snow on
the mountains.
--No,
we found a little snow, as most of it seemed _____ off the mountains.
A.to have blown B.to have been blown
C.to be blowing D.to be blown