题目内容

We __________ 1000 English words since we __________ to learn English.
A．learned; beginB．have learning; began
C．have learn; begunD．have been learning; began
D
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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