单选题：I was speaking to Ann on the phone about our tour plan _____

题目内容：

I was speaking to Ann on the phone about our tour plan _________ suddenly we were cut off. A．that
B．while
C．before
D．when

参考答案：【答案仅供学习，请勿对照自行用药等】

答案解析：

Although there are many predictions about the future，no one

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