children, all of whom are studying music.

关系副词 when, where, why: 它们的含义相当于 at which, in which, for which, 因此它们之间有交替使用的可能.

The day when he was born…

on which he was born…

which he was born on…

The office where he works…

at which he works…

which he works at…

有时可用that替代关系副词, 在口语中that 可省略.

Every time (that) the telephone rings, he gets nervous.

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(＞人＜；)