问题描述：
while when
______ we thank you for your enquiry,we regret being unable to make you an offer for the time being.
a.while b.When c.As d.Since
选哪个 为什么
______ we thank you for your enquiry,we regret being unable to make you an offer for the time being.
a.while b.When c.As d.Since
选哪个 为什么
问题解答：
我来补答展开全文阅读