题目内容
They__________ many happy hours__________ along the beach during that holiday.
A.spend,walk B.spent,walking C.cost,walk D.gave,walking
B

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– Look at these factories. I hate them. They____ many rivers here.
--Yes. Something ______ to stop the pollution.
A.polluted, must do | B.had polluted , must be doing |
C.have polluted , must be done | D.were polluting, must be done |