Did you visit your friends last Spring festival?为什么visit不加ed 急.

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Did you visit your friends last Spring festival?为什么visit不加ed 急.
Did you visit your friends last Spring festival?为什么visit不加ed 急.

Did you visit your friends last Spring festival?为什么visit不加ed 急.
时态已经在do那里体现了,do用过去式did,后面的不用加.
例如,I didn't visit my friends last Spring festival.
一样道理.