问题

.When she came out, Mary looked a bit tired because she _____the house

A:cleaned
B:was
C:had cleaned
D:had been cleaning

正确答案是：

同类题型

Jack,__ you ride a bike—Yes, I can.

下列各句中，没有语病的一句是（　　)

Kate is beginning to ______ and will soon recover under good treatment. [ ]

Who knows the meaning ofthe saying “ Time __________ will tell” —— __________Tom knows

I couldn’t stand the of not being able to help when my best friend was in trouble.