单项选择题

We are pleased to receive your order dated Nov. i8, but( ) that we cannot supply the goods as requested.

A. to regret
B. regretting
C. regretted
D. regret
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We give you on the attached sheet full details regarding packing and marking, which must be strictly ( ).
A. observed
B. abide by
C. submitted
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All flights ( ) bemuse of the snowstorm, we decided to go by se
a.A. were canceledB. having canceledC. having been canceledD. had been canceled
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