问题补充：
–I don’t know what I without the suitcase you lent me.
–Glad to have been of some help to you.
A. should have done
B. would do
C. would have done
D. should do
答案：
A. should have done
B. would do
(答案→)C. would have done
D. should do
解析：
试题分析:句意：——我不知道没有你借给我的提箱我会怎样做。——很高兴能对你有帮助。
“情态动词+v原形” 表示对现在的假设和虚拟；根据句意可知此处表示对过去发生事情的推测，故排除BD选项，should have done “本应该做某事”，根据otherwise判断此处是含蓄型的虚拟语气，选C。
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