问题
单项选择题
Mary forgot（）a letter to her mother, so she wrote to her just now.
A.writing
B.to write
C.having wrote
D.to have written
答案
参考答案：B
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Mary forgot（）a letter to her mother, so she wrote to her just now.
A.writing
B.to write
C.having wrote
D.to have written
参考答案：B