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【单选题】
Please compare the following pairs , and decide which are communcating positive messages. a. We are unable to complete your order until we receive proof of your payment. b. We look forward to completing your order as soon as we receive your payment. c. We are sorry that we must reject your application for credit at this point in time. d. At present we can serve you on a cash only.A.
a,c
B.
a,d
C.
b,d
D.
b,c
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