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Dung beetles ______ an integral part of the successful management of diary farms in Australia over the past few decades.
Dung beetles ______ an integral part of the successful management of diary farms in Australia over the past few decades.
admin
2013-12-13
33
问题
Dung beetles ______ an integral part of the successful management of diary farms in Australia over the past few decades.
选项
A、has become
B、have become
C、became
D、had become
答案
B
解析
时态题。在由until(till,up to)now,up to the present,so far,in (for,over,during)the past(last,recent)few(several,two...)months(days...)等构成的短语作状语的句子中常用现在完成时。主语dung beetles复数形式,故B正确。
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0
专业英语四级
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