在诊室外面等了将近四个小时后，护士终于叫他们进去了。
After they had been waiting outside the consulting room for nearly four hours, the nurse finally called them in.
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After英 /ˈɑːftə/|美 /ˈæftər/
had英 /hæd/|美 /hæd/
been英 /biːn/|美 /bɪn/
waiting英 /ˈweɪtɪŋ/|美 /ˈweɪtɪŋ/
解释
时间连词 After 后接过去完成进行时 had been waiting，长期的等待构成被叫入诊室这一主句事件发生前的直接背景。
After they had been waiting outside the consulting room for nearly four hours, the nurse finally called them in.
时间连词 After 后接过去完成进行时 had been waiting，长期的等待构成被叫入诊室这一主句事件发生前的直接背景。