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Trees ________ the air clean. ( )
A.keeps
B.keep
C.kept
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0.99难度 选择题 更新时间:2019-10-05 09:43:15
答案(点此获取答案解析)
同类题1
Let's
the weather
TV. ( )
A.Watching, on
B.watch ,on
C.watch, from
同类题2
Breakfast is very
. We should
breakfast every day. ( )
A.important; have
B.important; having
C.unimportant; have
D.important; had
同类题3
Let's
together. ( )
A.hop
B.hopping
C.flying
同类题4
I often help my mother
food in the kitchen. ( )
A.cook
B.cooking
C.cooks
同类题5
I ___Chinese. ( )
A.teach
B.teaches
C.teaching
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