【題目】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】D

【解析】

考查從屬連詞。句意：除非用心多記單詞和做大量的閱讀，否則就不能把英語學(xué)好。A. as由于；B. once一旦；C. when當(dāng)……時候；D. unless除非，如果不。分析句子可知，空白處表“除非”，用unless。故選D。

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