I once thought Jonna was a good student, for she often got a high mark but ________ she was found out to often cheat in examinations．A.actuallyB.trulyC.reallyD.mostly
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A解析actually放在句首，以表明事实与我原来认为的不一样。really和truly在语意和位置上都不合适。mostly是副词，意为“通常，大多数”，不合题意。