——Did you write to Grace last summer ? ——No but I’ll her over Christmas vacation .A. be s

问题补充：

——Did you write to Grace last summer ?

——No, but I’ll her over Christmas vacation .

A. be seen

B. be seeing

C. have seen

D. have been seeing

答案：

A. be seen

(答案→)B. be seeing

C. have seen

D. have been seeing

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