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A
had not been
B
is not
C
was not
D
has not been
正确答案 :A
解析
本题考查句法——虚拟语气。
句意:要不是他们的帮助,我们不可能及时完成任务。
A项:根据主句中could not have fulfilled可知,本句是对过去情况的假设,从句的谓语动词应用“would /could/ should/ might + had + 过去分词”。符合题意,故选A。
B、C、D项为干扰选项,故排除。
故本题答案为A。
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