After he got home he went ________ into his room, ________ his favorite CD and enjoyed it．
A.straight;turned off
B.straightly;turned on
C.straight;put on
D.straightly;turned up
答案 :
C
They are the scientists who have been known ________ in this region of the earth．
A.explored
B.to be explored
C.to explore
D.explore
答案 :
C
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