问题
选择题
I tried to call you ______ I heard from him, but you were not in. [ ]
A. since
B. while
C. until
D. as soon as
答案
答案：D
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I tried to call you ______ I heard from him, but you were not in. [ ]
A. since
B. while
C. until
D. as soon as
答案：D