问题补充：
He could hardly work alone, ?
A. could he
B. couldn he
C. didn he
D. did he
答案：
(答案→)A. could he
B. couldn he
C. didn he
D. did he
解析：句意：他几乎不能独自工作，是吗。因为这是反义疑问句，逗号前有否定副词hardly几乎不；所以逗号后应该用肯定的形式。因为前面的谓语动词用的是情态动词could，所以后半部分还是用could，故选A。
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