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(dǎo)的時(shí)間狀語從句中，當(dāng)從句中用since+表示一般過去時(shí)時(shí)，主句要用現(xiàn)在 完成進(jìn)行時(shí)或現(xiàn)在完成進(jìn)行時(shí)，（動(dòng)詞必須是延續(xù)性動(dòng)詞）故選D
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