Had Yeats stopped writing at age 40, probably he valued as a minor poet now.A. would beB.

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(答案→)A. would be
B. had been
C. is
D. would have been
解析：句意：假如叶芝在40 岁时停止写作的话，大概他现在就被认为是一个无足轻重的诗人了。C. is是真实的情况下的谓语。本句是考查if引导的虚拟语气句。与过去事实相反的情况，从句中谓语用had done，主句谓语用would have done。当if 从句中含有had、were、或should时，可以省略if，把had、were、或should放在句首。本句就是这种情况。本句是错综时间句，前半句与过去事实相反，后半句与现在事实相反，用would be，选A。
考点: 考查虚拟语气的用法。