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 引導的時間狀語從句中，當從句中用since+表示一般過去時時，主句要用現(xiàn)在 完成進行時或現(xiàn)在完成進行時，（動詞必須是延續(xù)性動詞）故選D
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