D by the time 直到……的時候,直到他從醫(yī)學院校畢業(yè)時候,他已經(jīng)做了5年的醫(yī)生；要用一般過去式,首先畢業(yè)是過去的動作,而且前面的had been過去完成時也驗證了后面應該用一般過去,因為它發(fā)生在graduated之前.
by the time用法：
1.表示將來的時間.
主句用將來完成時,而從句用一般現(xiàn)在時來表示將來的動作.
如:I will have finishied the work by the time my father comes back.
2.表示過去的時間.
主句用過去完成時,而從句用一般過去時.
如：He had built a lab for himself by the time he was 12 years old.
He had been a doctor for five years by the time he ____from the medical school
He had been a doctor for five years by the time he ____from the medical school
A:will graduate B:will have graduated
C:graduates D:graduated
A:will graduate B:will have graduated
C:graduates D:graduated
英語人氣：212 ℃時間：2019-10-11 00:19:01
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