问题
What can trees do _________ us — They can _________ harmful gases and produceoxygen .
A:helping ,take in
B:to help ,take in
C:helping ,take out
D:to help ,take care
B:to help ,take in
C:helping ,take out
D:to help ,take care
正确答案是：
同类题型
He has _______ for two years.. Two years _______ a long time.
Not only ______ strict with us, but also ______ for us .
It’s very friendly ________ him to help me when I’m in trouble.
I usually have my breakfast at 6:30 a. m.— ________ . [ ]
Did you return the book you borrowed from Tom?— Yes, I gave it to him ______ I saw him.