we saw many students--basketball when we went for a walk A.to play B.playing C.played D.plays

we saw many students--basketball when we went for a walk A.to play B.playing C.played D.plays

题目
we saw many students--basketball when we went for a walk A.to play B.playing C.played D.plays
选哪个啊.
答案
B.这里的play是第二个动词,所以要加ing
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