为什么要加I？

显示全部楼层 · 2010-8-9 15:19:09

16. Some are ______ in the river and some are ______ games.
A. swimming… playing
B. swimming…plaiing
C. swimming… I playing
D. swimming…plaing
答案是C，为什么？

千问 · 2010-8-9 15:19:09

因为答案错了

千问 · 2010-8-9 15:19:09

真的是答案错了。