问题
选择题
There was _____ time _____ Chinese used foreign oil. [ ]
A. a; when
B. a; while
C. /; when
D. /; while
答案
答案：A
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There was _____ time _____ Chinese used foreign oil. [ ]
A. a; when
B. a; while
C. /; when
D. /; while
答案：A