Question

Tom rushed into the house _________ his mother was cooking．

[　　]

A．as

B．before

C．while

D．after

Answer 1

答案：C
解析：

考查连词的用法。从句意可以看出rushed into the house与was cooking是同时发生的，故答案选C，意为“当……时候”，引导过去将来时。