问题
选择题
Someone called me up in the middle of the night, but they hung up _____ I could answer the phone. [ ]
A. as
B. since
C. until
D. before
答案
答案：D
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Someone called me up in the middle of the night, but they hung up _____ I could answer the phone. [ ]
A. as
B. since
C. until
D. before
答案：D