The students were singing an English song _______ Mr. Jackson came into the classroom.
| A．while | B．when | C．before | D．as |
更新时间：2016-11-26 00:22:42
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【知识点】 词义辨析—暂存
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【推荐1】What’s the weather like today? It’s ______.
| A．sun | B．sun day | C．sunny | D．sunny day |
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【推荐2】Please ____ the TV, the baby is sleeping now.
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