15. Nowadays with the development of science more and more new technologyto the fields of

问题补充：

15. Nowadays with the development of science, more and more new technologyto the fields of IT.

A. has introduced

B. was introduced

C. will introduce

D. is being introduced

答案：

A. has introduced

B. was introduced

C. will introduce

(答案→)D. is being introduced

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