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1.My elder sister ____a way to work out the math proble.

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1.My elder sister ____a way to work out the math proble.
A.thought B.ran across C.came up with D.went through
2.-The sound of the radio is too loud.Will you please____?
-Sorry,I'm trying to find out what's wrong with it.
A.turn it down B.turn it on C.turn off D.turn it up
3.Last weekend,an Enlish play was___in the school hall.
A.put in B.put down C.put on D.put up
2.C put it off
1 C (come up with 意思是提出,原句为我的姐姐提出了一种方法来解决这个数学问题)
2 A (turn down是关小声些,不能选c,因为turn off是及物动词,要加宾语,而c项没有,而put off是推迟的意思)
3 C (put on a show)