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(2). (单选题) Why people are always unhappy?(本题2.0分)
A、 to compare with others
B、 to be ungrateful
C、 to focus on minor flaws
D、 all of the above
A、 to compare with others
B、 to be ungrateful
C、 to focus on minor flaws
D、 all of the above
参考答案
