---I’m going to the post office.---____ you are there,can you buy me some stamps?A.As B.While C.Because D.If 当.时 A B如何区别?为什么选B?

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---I’m going to the post office.---____ you are there,can you buy me some stamps?A.As B.While C.Because D.If 当.时 A B如何区别?为什么选B?

---I’m going to the post office.---____ you are there,can you buy me some stamps?A.As B.While C.Because D.If 当.时 A B如何区别?为什么选B?
---I’m going to the post office.---____ you are there,can you buy me some stamps?
A.As B.While C.Because D.If
当.时 A B如何区别?
为什么选B?

---I’m going to the post office.---____ you are there,can you buy me some stamps?A.As B.While C.Because D.If 当.时 A B如何区别?为什么选B?
在用做 “当 ...时”,as 比 when 和 while 有更多的限制性,绝少出现在句首,尤其是口语对话中几乎完全不会用到.