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He opened the door and let himself in quietly ___ not to bother the family.
A、because
B、so as
C、so that
D、despite
【正确答案】：B
【题目解析】： 本题测试连词辨析。本句的意思是：“他为了不吵醒家人，打开门悄悄地去了。”so as to 的意思是“为了”。Because后面跟原因状语从句；so that后面跟目的或结果状语从句。