根据网考网考试中心的统计分析，以下试题在2016-1-21日托业考试习题练习中，答错率较高，为：76%
【单选题】 Only five years ago, there ______a shortage of computer specialists.
A．(A) was
B．(B) were
C．(C) has been
D．(D) have been
参考答案：A，答错率：76%
试题解析：
The simple past tense is required. Choice (B) is past tense but does not agree with the singular subject shortage. ...查看试题解析出处>>
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