Question

Peter ________ his homework when Rose went to get her book she ________ in his room．

[　　]

A．

did; had left

B．

was doing; had left

C．

had done; left

D．

had done; was leaving

Answer 1

答案：B
解析：

when 在句中意思是at the same time，所以前面的句子是过去进行时，而后面句子中动作是在去拿书之前发生，故用过去完成时。