When I got home, it began _____. [ ]
A. rain
B. to rain
C. to raining
D. rains
答案:B
改错。
( ) 1. Jenny needs a pair of sock. ________________
A B C
( ) 2. I need to pack my suitcase to my clothes. ________________
( ) 3. What clothes does you need? ________________
( ) 4. Tomorrow we leave from Beijing. ________________
如何判断母牛是否发情?