题目内容
Be careful when________ the homework.A.doing
B.do
C.you doing
D.you did
答案:A
解析:
提示:
解析:
| when/while doing sth. ,sb. …此句型中。前后主语一致。
|
提示:
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题目内容
Be careful when________ the homework.A.doing
B.do
C.you doing
D.you did
| when/while doing sth. ,sb. …此句型中。前后主语一致。
|