She wanted the fort of a large car and the low cost of a small one，so she bought a size in between the two______.A.for promiseB.as a promiseC.as promiseD.for a promise
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B解析此题考查介词。for“(表示目的)为了；因为；至于，对于，适合于”；as“作为”，as a promise“作为折中”。句意：她想要大车的舒适，小车的价钱，因此作为折中买了一辆大小在两者之间的轿车。