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英语题,急1.Cross the road .Walk___(quick,quickly)!2.We are walki

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英语题,急
1.Cross the road .Walk___(quick,quickly)!
2.We are walking ___(cross,across)the road.
3.We must keep room clean _____home.
A.in the B.at C.at the D.in
4.We must wait for the green man.(改成一般疑问句)
_____we _____for the green man?
说下道理撒!
1.quickly
用副词修饰动词walk.
2.across
walk已经是动词,所以不能再加动词cross,而使用介词across
3.B
固定短语at home“在家里”
4.Must,wait
含义情态动词must的陈述句,变一般疑问句时,把情态动词提前即可,另外还应该把问句的主语变成you,而不是we.