he could be ------- a letter A.write B.writing C.to write D.writes

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he could be ------- a letter A.write B.writing C.to write D.writes

he could be ------- a letter A.write B.writing C.to write D.writes
he could be ------- a letter A.write B.writing C.to write D.writes

he could be ------- a letter A.write B.writing C.to write D.writes
B
他可能正在写信.系动词be加动词ing表进行的动作.
其他的不能加be搭配.

b

B.writing