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1.I feel very happy that I____to be the host

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1.I feel very happy that I____to be the host
A.choose B.am chosen C.was chosen D.haven chosen
2.-Inventors have changed the way we live.
-So they are famous for the great things they _____
A.do B.did C.are doing D.had done
1.C
choose sb to be选某人当……
这里应是被动:某人被选为……
肯定是为已经发生的事高兴,故用过去时
2.B
那些事实过去做的,故用一般过去时
had done 表过去的过去,所以不选