题目内容
We can’t do well in examinations we study hard in school time.
| A．if | B．and | C．since | D．unless |
D
解析试题分析：句意：我们不能考好，除非我们在上学的时候努力学习。If如果；and和；since自从；unless除非。所以选D。
考点：考查连词。
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