If these kind-hearted soldiers us last week, we would not have such a good harvest.A. hel

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A. helped
B. had helped
(答案→)C. had not helped
D. didn’t help
解析：考查错综时间条件句。从主句 would not have可以看出与现在相反，再观察从句状语 last week可知，从句与过去相反，使用had done,结合句意,应用否定，故选C。句意，如果这些热心的战士上周没有帮助我们，我们就不可能有这么好得收成。