We 1000 English words since we to learn English.A. learned; beginB. have learning; began

We 1000 English words since we to learn English.
A. learned; begin
B. have learning; began
C. have learn; begun
D. have been learning; began

A. learned; beginB. have learning; beganC. have learn; begun(答案→)D. have been learning; began解析：since 引导的时间状语从句中，当从句中用since+表示一般过去时时，主句要用现在 完成进行时或现在完成进行时，（动词必须是延续性动词）故选D

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