這句話(huà)的意思是通知飛機(jī)起飛的時(shí)間了嗎?
when是對(duì)it的說(shuō)明,是一個(gè)主語(yǔ)從句,代表起飛的時(shí)間,所以就要用when.
it被通知,這個(gè)it是什么呢,后面就用when來(lái)說(shuō)明了,是起飛的時(shí)間.
has it been announced when the plane is to take off中為什么用when
has it been announced when the plane is to take off中為什么用when
英語(yǔ)人氣：444 ℃時(shí)間：2019-12-21 17:28:07
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