----- What does Canada export?
---- A large quantity of wheat sent away.
A. is
B. are
C. have
D. is being
网友回答
(答案→)A. is
B. are
C. have
D. is being
解析：A考查主谓语的一致性。A large quantity of---作主语谓语动词的数取决于of 后面的名词，quantities of---作主语不管of 后面的名词是可数还是不可数，谓语动词一般用复数。