—Did you get my letter? —I received one just as I.A. set outB. had set outC. was setting

问题补充：

—Did you get my letter?

—I received one just as I.

A. set out

B. had set out

C. was setting out

D. would set out

答案：

A. set out

B. had set out

(答案→)C. was setting out

D. would set out

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