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单选题
In the past 50 years, there _____ a great increase in the amount of research _____ on the human brain.
A
was...did
B
has been...to be done
C
was...doing
D
has been...done
参考答案
参考解析
解析：
根据in the past 50 years判断，需用现在完成时。过去分词短语和不定式都能做定语，但本句想表达的是已经做了的实验，因此应用过去分词表完成和被动，选项D正确。
根据in the past 50 years判断，需用现在完成时。过去分词短语和不定式都能做定语，但本句想表达的是已经做了的实验，因此应用过去分词表完成和被动，选项D正确。
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