单项选择 较难0.4 引用3 组卷386
________ they decided which subject to choose, students should continue researching these guidebooks.
A.As | B.Since | C.While | D.Until |
2021·江苏苏州·二模
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We have formed a habit of wearing masks ________ we go to public places.
A.until | B.since | C.after | D.whenever |
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