题目内容
【题目】He __________ that until he __________ the directions once again.
A. didn't understand ; had read
B. hadn't understood ; read
C. understood ;had read
D. understood ; read
【答案】B
【解析】句意:直到又读了一次说明书他才算搞清楚。考查状语从句。根据句意可知选B。
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