(2013·高考安徽卷)It ________ be the vocabulary that caused you the problem in the exercise because you know a lot of words.
A．mayB．couldn’t
C．shouldD．needn’t
B
選B。句意：你難以完成那道練習(xí)題，不可能是詞匯量的原因，因?yàn)槟阏莆樟舜罅康脑~匯。根據(jù)原因狀語(yǔ)從句 because you know a lot of words可知，主句應(yīng)該是否定的，A項(xiàng)和C項(xiàng)可排除。needn’t表示“不必”。此處為對(duì)可能性的推測(cè)，couldn’t表示“不可能”。
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