BeforehemovedtotheUnitedStates,he
問題詳情：
Before he moved to the United States, he _________ English for six years.
A. is learning B. will learn C. has learned D. had learned
【回答】
D
知識點：動詞時態與語態
題型：選擇題
問題詳情：
Before he moved to the United States, he _________ English for six years.
A. is learning B. will learn C. has learned D. had learned
【回答】
D
知識點：動詞時態與語態
題型：選擇題
