Question

选择最佳答案，完成非限制性定语从句

He lived in London for 3 months, during ________ he picked up some English．

[　　]

A．

this

B．

which

C．

that

D．

when

Answer 1

答案：B
解析：

非限制性定语从句，代指前面的分句，只能用which来引导，during为介词。