The children aren't at home.They______(go)to thepark填什么还有l两题Air is _____(colour).We can't see it.The new airport was in use in1998.(改为同义句)The new airport______ ______ ______ _______ ______ 1998.再来个分析
问题描述：
The children aren't at home.They______(go)to thepark
填什么
还有l两题
Air is _____(colour).We can't see it.
The new airport was in use in1998.(改为同义句)
The new airport______ ______ ______ _______ ______ 1998.
再来个分析
答
went
colourless
was put into use in
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答
1 went
2 colourless
3 was in service in
答
have gone
答
have gone to
colourless
has been in use since
答
have gone
colourless
was put into use since