Zheng says that the most dangerous thing about a credit card is____ a person isn’t always aware of the fact____ he’s spending money.A.that; thatB.what; thatC.that; whatD.what; which
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A解析____ a person isn’t always aware of the fact是表语从句，且句意完整，用that引导；____ he’s spending money是the fact的同位语从句，语意完整，用that引导。所以选A。