We （） be glad if you could send us samples and quotations.

单项选择题We have received your enquiry of October 15 （） we learn that you are interested in our black tea.

A.in which
B.from which
C.which
D.at which

单项选择题We shall appreciate （） us your most competitive prices.

A.your quoting
B.you quoting
C.you to quote
D.quote