【題目】There __________ great changes in the smart mobile phones in the last few years.

A. was B. have been

C. has been D. were

【答案】B

【解析】

試題分析：句意：在過去的幾年里智能手機有了巨大的變化。根據(jù)in the last few years.可知該用現(xiàn)在完成時，所以選B.

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