◎ 题干
We won't be able to learn English well _____ we learn enough words by heart and do enough reading.

[     ]

A. as
B. once
C. when
D. unless
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“We won't be able to learn English well _____we learn enough words by heart and do enough reading. [ ]A. as B. once C. when D. unless …”主要考查了你对  【从属连词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。