单选题
A: ______if you'd serve me as quickly as possible as I've got an appointment at two fifteen.
B: I'll do my best, Madam.
A、
It would be very kind of you
B、
It would be very helpful
C、
I'd be most delightful
D、
I'd be most grateful
【正确答案】
D
【答案解析】
[解析] be grateful后面加上句子表示委婉的请求。故选D项。
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