With the development of high technology more and more new things to the field of IT．A. h

问题补充：

With the development of high technology, more and more new things to the field of IT．

A. have introduced

B. are being introduced

C. were introduced

D. had been introduced

答案：

A. have introduced

(答案→)B. are being introduced

C. were introduced

D. had been introduced

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