—Are you going to buy a new camera?—Yes. But there are so many cameras that I can't decide______________.
A:how to use
B:where to sell
C:which to buy
根据句意,选择方框中的单词,将其正确形式填入句中空格,并将答案写在相应位置。
devote; purpose; generous; graduate; outdoors; recognize; doubt; actually
如图,⊙O是△ABC的外接圆,∠OCB=40°,则∠A的度数等于()