Although he was ill,______ he went on working.

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问题 Although he was ill,______ he went on working.

选项 A、but
B、yet
C、and
D、while

答案B

解析 A 和D 尽管有转折的意思,但不能与though/although 同时使用。至于C 项,则明显不符合句意,予以排除。
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