The factory used 65 percent of the raw materials, the rest of which _______ saved for other purpose.
A.is
B.are
C.was
D.were
答案:D
考察主谓一致。Which指代先行词materials,当the rest在句中作主语时,谓语动词的单复数取决于后面的名词,如果是名词是不可数名词,用单数。如果是可数名词复数,谓语动词用复数形式。本句中的materials是可数名词复数形式。