题目内容
Only in this way, directed by the teacher, ______work out the problem the day before.
| A.had they | B.they could | C.could they | D.did they |
D
解析
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题目内容
Only in this way, directed by the teacher, ______work out the problem the day before.
| A.had they | B.they could | C.could they | D.did they |
D
解析
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