Question

We __________ 1000 English words since we __________ to learn English.

1. A.
   learned; begin
2. B.
   have learning; began
3. C.
   have learn; begun
4. D.
   have been learning; began

Answer 1

D
since 引導(dǎo)的時(shí)間狀語(yǔ)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