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. was knowing
D. had known
网友回答
(答案→)A. knew
B. knows
C. was knowing
D. had known
解析：句意：不要把他的话太当真。他太难过了我想他不知道他当时在说什么。从what he was
saying.可知是当时不知道在说什么，用一般过去式，选A