The past two years ___ a sharp rise in oil price,which adds

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The past two years ___ a sharp rise in oil price,which adds to the burden of auto transportation industry.
A.witnessed B.has witnessed C.is witnessin D.witnesses
这里为什么要用现在完成时?一般现在时不可以吗?
All of the flowers now raised here haved developed from thoes ___ in the forest.
A.once they grew B.they grew once C.they once grew D.once grew

第一题
此事发生在过去,影响持续到现在,正符合现在完成时的使用条件.
一般现在时通常用于描述不变的事实或习惯性动作.
第二题
haved,thoes 题目拼错了或者是你打错了,是have 和 those 吧
这个我觉得真的主要靠语感的积累了,时间副词通常位于动词前或句子末尾.

The past two years ___ a sharp rise in oil price,which adds 1.there has been a sharp rise in the(price/cost/value)of liv in the past two years the price of oil has been( )in recent years. in the past two years事态 in the past two years 是什么时态 in the past two years,the poor worker ___ about the thousand One more reason not to lose sleep over the rise in oil price During the past two years与in the past two years区别 His life ___ ___(change) a lot in the past three years in the last two years/during the last two years/in the past The famous writer___one new book in the past two years.