问题

_____ the classroom, I found his pen lying on the ground. [ ]

A: When cleaned
B: If cleaned
C: When cleaning
D: If cleaning

正确答案是：

同类题型

She drove so fast at the turn that the car almost went _______ the road.

Will you go to the fashion show on Saturday— Yes, I will if I ___________.

Mary runs ______ of all the girls in her school, and she won the 100-meter race last month.

Please make a model plane and then ___________ it red.

The schools themselves admit that not all childrenwill be successful in the jobs ______ they are being trained.