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單選題In the major palm oil producing regions, Indonesia and Malaysia, it is estimated that almost one-third of forest loss in the past 10 years have been due to the expansion of oil palm.
A.is
B.are
C.has been
D.Were
參考答案：C
答案解析：這句話的意思是：在主要的棕櫚油產區(qū)印度尼西亞和馬來西亞，據(jù)估計，過去十年近三分之一的森林損失是由油棕的擴張造成的。該句考查主謂一致。almost one-third of forest loss in the past 10 years為主語，因為主語為單數(shù)意義，所以謂語動詞用第三人稱單數(shù)形式，排除B、D；此處表示過去發(fā)生的事情對現(xiàn)在造成的影響，要用現(xiàn)在完成時，排除A。因此答案為C。
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