第30题: [单项选择]______ for your help, we'd never have been able to get over the difficulties. A. If we had not been B. Were it not C. If it were not D. Had it not been 参考答案:D 答案解析:本题意为:要不是你的帮忙,我们不会克服困难的。if引导的虚拟条件句中含有 should,had,were时,省略if将should,had,were提至主语之前。