问题

It was along the Mississippi River ________ Mark Twain spent much of his childhood

A:to be updated
B:tohave been updated
C:to update
D:to have uodated

正确答案是：

同类题型

If more salt______ to the soup,it will taste better

It isn’t clear_____ is to blame.We need to find a solution to the problem first.

can’t afford meat, we shall have to____ with fish

Tommy is plone.

Would you like to go hiking with us—Sorry. My grandmother is ill. I’ll go to her.