The past two years ________ a sharp rise in oil price，which adds to the burden of auto transportation industry.
A．witnessedB．has witnessed
C．is witnessingD．witnesses
B
考查動詞的時態(tài)。根據(jù)從句的時態(tài)可排除A項，主句主語為the past two years，故使用現(xiàn)在完成時態(tài)，表示動作已完成，而且這個動作的結(jié)果對現(xiàn)在的情況仍有影響。
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