考博考试

试题来源：考博英语-103
【单选题】 I was halfway back to the cottage where my mother lived ______Susan caught up with me.
A．when
B．while
C．until
D．though

参考答案：A
网考网解析：
[解析] When为特殊用法，意为：“其时，就在... 查看试题解析出处>>