【題目】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：直到又讀了一次說明書他才算搞清楚。考查狀語從句。根據(jù)句意可知選B。

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