Bob stayed at home last sunday and did everything except_____clothesAwashBto washCwashingDwashed为什么选A Except 不是介词吗

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Bobstayedathomelastsundayanddideverythingexcept_____clothesAwashBtowashCwashingDwashed为什么选AExcept不是介

Bob stayed at home last sunday and did everything except_____clothesAwashBto washCwashingDwashed为什么选A Except 不是介词吗
Bob stayed at home last sunday and did everything except_____clothes
Awash
Bto wash
Cwashing
Dwashed
为什么选A Except 不是介词吗

Bob stayed at home last sunday and did everything except_____clothesAwashBto washCwashingDwashed为什么选A Except 不是介词吗
这个except 相当于but,这是少数的可以跟不定式的词.但是因为前面有实意动词did/do/to do 介词后面的不定式符号to 省略.如He did nothing but sleep./He had nothing to do but wait./ He had no choice but to sleep.