look who (cut) trees over there?--they down a l

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look who ______(cut) trees over there?--they ______ down a lot of trees last sunday.

are cutting , cut
根据look 判断,第一空用现进,再根据第二句中的they,可知第一空填are cutting 而不是is cutting . 根据过去时间 last sunday判断第二空用过去式cut . this was his first visit ___ china ,he said the trip ____china was very interesting.
A.to,to B. to ,for选A
再问： who 是代词。应用三单？
再答：在不知道多少人的情况下,用三单,如: Who is knocking at the door ? 但此句后面有个they,因此要用are cutting .

look who ______(cut) trees over there?--they ______ down a l Last year a large number of trees ______(cut)down.The old wo #[34] With a number of trees cut down,______ soil is washed Look at those children ______ a lovely dog over there. Who is that young woman ______ is standing over there? A．who Look!There are ______ sleep on the hill over there. Let's sit down over there and watch the kid ______ a kite. The boys ______(cut ) down a young appale tree Look!______ two over there are my parents.a these b this c t "Who is the girl over there?" "______." [ ] A. She is ten ye Mike,go and see who ______ catch over there A are playing B "Who is the girl over there?" "______." [ ] A.She is ten yea