摘要： --Can I make any changes? --You certainly can . A. when you are necessary B. when is necessary C. if necessary D. when it necessary
网址：http://m.1010jiajiao.com/timu3_id_2964582[举报]
—Can I make any changes?
—You certainly can________ .
A. when you are necessary B. when is necessary
C. if necessary D. when it necessary
查看习题详情和答案>>