单项选择题

If I ______ twenty years old, I ______ the course of computer science.

A. was; would take


B. were; would take
C. would be; had taken


D. am; will take
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It was very cold ______ they still went swimming.
A. although



B. but
C. however



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After ______ their enquiry, we sent them a quotation.
A. receive
B. received
C. receiving



D. receives
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