向别人介绍自己的朋友时，可以说：A.This is Liu Tao. B.I’m Liu Tao. C.Nice to meet you.
Ma Liang _____ a paintbrush. A. hasB. haveC. had
_____ people invented paper. A. English B. Chinese C. American
Daming_____ his trousers yesterday. A. washes B. washing C. washed
Yesterday I _____ my bedroom. A. clean B. cleaned C. cleans
选择并改错，把错误的一项圈起来，在句子后来改正。
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