问题
Studying online is popular among students in Suzhou，______they are free to choose what to learn and when in this way．
A:while;
B:if
C:though;
D:as;
B:if
C:though;
D:as;
正确答案是：
同类题型
on her way , Jenny finally managed to get tothe station in time
The light in the office is still on.—–Oh, I forget to _____.
I didn’t go to the mountains ______the bad weather.
How far is your school from Xiu Shan Park—Not very far. It’s about twenty _______riding.
.If you compare food costs today ______ of a year ago, you will find the difference