Don’t take his remarks too seriously. He was so sad that I don’t think he really what he was saying.
A. knew
B. knows
C. besides
D. therefore
网友回答
(答案→)A. knew
B. knows
C. besides
D. therefore
解析：句意：不要对他所说的太认真。他是如此悲伤的以至于我认为他真的不知道他在说什么。think后接宾语从句，宾语从句是的时态用一般过去时，故选A