When my borther found out that they treated his girlfriend so badly, he was ______.
A. convinced
B. furious
C. merry
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They were both very sad, so they had a ______ goodbye at the airport.
A. bored
B. tearful
C. amazed
I was very ______ with my test results.
A. jealous
B. sympathetic
C. disappointed
I am 100% _______ that he will find another job.
A. enthusiastic
B. convinced
C. surprised
唯物史观在考察谁是历史的创造者时坚持了怎样的原则?