Just I don’t plain, people think that I am satisfied.
A. because
B. because of
C. that
D. according to
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(答案→)A. because
B. because of
C. that
D. according to
解析：词义辨析。A. 因为，后面接从句 B. 因为，接名词或名词性短语 C. 引导从句，意思为因为，以至于 ，原因在前 D. 根据；按照。句意：只是因为我不抱怨，人们就认为我很满意。后面为从句，故选A。