單項選擇題

Not until this morning（）your delayed letter of credit.

A.we received
B.did we receive
C.we have received
D.had we received

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The terms agreed（）Mr.Goodman at the Guangzhou Fair embodied much concession on our part.

A.to，by
B.from，with
C.in，from
D.upon，with

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The purpose of this ad campaign is to（）the prospective customers’interest in this latest model of ours.

A.appeal
B.encourage
C.arouse
D.attract