单项选择题

It was very cold ______ they still went swimming.

A. although



B. but
C. however



D. though
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单项选择题
After ______ their enquiry, we sent them a quotation.
A. receive
B. received
C. receiving



D. receives
单项选择题
When send your quotation sheet, please ______ send sample of the quote goods.
A. not forget



B. do not forget
C. do not forget to



D. forget not to
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