问题
It’s a shame ______ able to give them anyadvice.
A:not to have been
B:to have not been
C:to have been not
D:to not have been
B:to have not been
C:to have been not
D:to not have been
正确答案是：
同类题型
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___ the class done most of thework— Yes, but the rest ___________ ratherdifficult.