题目内容
Every student is required to watch the teacher carefully before ___ the chemistry experiment.
| A.performing | B.taking | C.picking | D.having |
A
解析
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题目内容
Every student is required to watch the teacher carefully before ___ the chemistry experiment.
| A.performing | B.taking | C.picking | D.having |
A
解析
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||