问题
Their country has plenty of oil, __________ ours has none.[ ]
A: when
B: while
C: before
D: where
B: while
C: before
D: where
正确答案是：
同类题型
Anna is going on a tour of Xi’an, and she wants to_____Chinese history.
Well done ! The customers were_____ by your wonderful body language. [ ]
My last job lacked variety; I __________ the same things all the time
Two years _____ since I came here.
Our town________poor in the past,but great changes________in the town in the past three years[ ]