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单选题
Only five years ago, there ______ a shortage of computer specialists.
A
was
B
were
C
has been
D
have been
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参考解析
解析：
根据句中ago可知句子用一般过去时，there be句型中be动词的单复数与表语一致，句中a shortage of为单数，所以用was。
根据句中ago可知句子用一般过去时，there be句型中be动词的单复数与表语一致，句中a shortage of为单数，所以用was。
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