by the time 引導(dǎo)時(shí)間狀語從句時(shí),從句是過去時(shí),主句用過去完成時(shí)
從句是現(xiàn)在時(shí),主句用現(xiàn)在完成時(shí)或者將來完成時(shí).
此句子講述過去的事情,所以答案為：
went into/ entered/came into; had been/had started/had begun 皆可
當(dāng)他走進(jìn)教室時(shí),老師已經(jīng)開始教學(xué)了.By the time he_ _the classroom ,the teacher_ _teaching already
當(dāng)他走進(jìn)教室時(shí),老師已經(jīng)開始教學(xué)了.By the time he_ _the classroom ,the teacher_ _teaching already
英語人氣：539 ℃時(shí)間：2020-05-15 14:14:03
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