For each sentence there are four choices marked A, B, C and D. Choose the ONE that best completes the sentence. 11 . Financial experts have _ signs that the economy is beginning to improve.

题型说明 Directions: There are a number of incomplete sentences in this part. For each sentence there are four choices marked A, B, C and D. Choose the ONE that best completes the sentence. 

11 . Financial experts have _ signs that the economy is beginning to improve.

 A. optimized 

B. accessed 

C. detected 

D. alerted

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