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lastsundaymorning,ididnothingbut(write)alettertomygrandma.请写明原因,

题目详情
last sunday morning ,i did nothing but ___(write) a letter to my grandma.
请写明原因,
▼优质解答
答案和解析
write
do nothing but do sth 只做了某事
but 接非谓语动词时,只能接不定式,注意:有do 无to