Tommy had had a three-mile drive north __爱下问搜题

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问题选择题

Tommy had had a three-mile drive north _____ he could turn and head back south.

A. while
B. as
C. before
D. after

答案

答案：C

名词解释

不图得见颜色，幸垂怜悯　　幸垂：

问答题简答题

试述香菇袋栽的技术要点。