问题补充：
It’s a pity that Andrew didn’t want to go to the conference. willing to go，we could have paid all his expenses.
A. Had he been
B. Being
C. Was he
D. He had been
答案：
A. Had he been
B. Being
C. Was he
D. He had been
解析：A
解析考查虚拟语气与倒装。根据第一句中的时态可知此处是对过去情况的虚拟，意思是“如果他愿意去，我们会支付他所有的费用”。此处是省略了虚拟条件句中的if而引起的倒装，其正常语序应为“If he had been willing to go”。
