--Did you write to Mary last month? --No but I’llher over Christmas Day.A. be seen 　B. be

问题补充：

--Did you write to Mary last month?

--No, but I’llher over Christmas Day.

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

解析：将来进行时will/shall be doing sth.。可用于表达预计即将发生或势必要发生的动作，在一般情况下可和一般将来时换用，用将来进行时则显得更加委婉。