She stepped into the bedroom quietly she might wake up her roommates.
A. for fear that
B. so long as
C. on condition that
D. in order that
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(答案→)A. for fear that
B. so long as
C. on condition that
D. in order that
解析：so long as 只要；on condition that…只要；in order that…为了；for fear that…唯恐，以防。