arrive 是瞬間動(dòng)詞,不能和while 表示時(shí)間段的連詞連用
when 時(shí)點(diǎn),時(shí)段
while 時(shí)段
請(qǐng)及時(shí)采納,不懂繼續(xù)問( 天天在線 ）
what were you doing when he arrived
what were you doing when he arrived
為什么是 when 不是while
when 和while 后面跟什么時(shí)態(tài)
為什么是 when 不是while
when 和while 后面跟什么時(shí)態(tài)
英語(yǔ)人氣：958 ℃時(shí)間：2019-09-06 09:15:37
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