12. He couldn't speak; he could only mouth several words which sometimes were hard    .

A. understand       B. understood

C. understanding    D. to understand

12.   D考查非謂語動詞。句意：他不會說話；他只能喃喃地說幾個詞，有時很難聽懂。解題關(guān)鍵：熟知句型"sb/sth be + adj. +todo"的用法。分析句子結(jié)構(gòu)可知所填空的句子是定語從句，主句為he could only mouth several words ，從句為which sometimes were hard...，故選D。

題目來源：2015全品語法快練高中英語新課標(biāo) > 訓(xùn)練18 非謂語動詞和獨立主格

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