【题目】He insisted that he _____ from heart trouble, but I didn't think so.
A. should suffer B. has suffered
C. suffers D. was suffering
在线课程【答案】D
【解析】
试题分析：考查动词的时态。insist作坚决要求、一定要,其宾语从句常用与将来事实相反的虚拟语气,即should+动词原形,其中should可以省略。insist作坚持说、坚持认为时,用陈述语气。此处insist作坚持说讲故D正确