The problem _______ at tomorrow’s meeting is a very difficult one.
A. being discussed
B. discussed
C. to be discussed
D. to discuss
若同维向量a和向量b对应的分量相等,则a与b相等吗
A. 对
B. 错
He reached the station _____ only _____ that the train had just left.
A. tired；learned
B. tiring；learning
C. to tire；to learn
D. tired；to learn
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