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 Engl

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．

this

which

that

when

试题答案

答案：B

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。