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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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