"I thought you had planned to practice the piano today." "I did nothing but ____letters all day."a、wroteb、writingc、to writed、write

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"I thought you had planned to practice the piano today." "I did nothing but ____letters all day."a、wroteb、writingc、to writed、write
"I thought you had planned to practice the piano today." "I did nothing but ____letters all day."
a、wrote
b、writing
c、to write
d、write

"I thought you had planned to practice the piano today." "I did nothing but ____letters all day."a、wroteb、writingc、to writed、write
B. writing
but 是介词,后面要接名词或者动名词

A 考查nothing but 有三种形式
1 加名词或代词 i love nothing but swim(swim为名词)
2 不定式 to do
3 当前方的动词为do的各种时态时则选择nothing but+动词(根据时态变化)

B

、writing