The past two years ________ a sharp rise in oil pricewhich adds to the burden of auto transportation industry.

Awitnessed Bhas witnessed

Cis witnessing Dwitnesses

 

B

【解析】考查動(dòng)詞的時(shí)態(tài)。根據(jù)從句的時(shí)態(tài)可排除A項(xiàng),主句主語為the past two years,故使用現(xiàn)在完成時(shí)態(tài),表示動(dòng)作已完成,而且這個(gè)動(dòng)作的結(jié)果對(duì)現(xiàn)在的情況仍有影響。

 

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