托业考试

试题来源：托业-2
【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
网考网解析：
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>>