问题补充:
Although he is very old, he works very hard.
A. and
B. but
C. /
D. so
答案:
A. and
B. but
(答案→)C. /
D. so
解析:句意:尽管他很年长,但是他工作很努力。在英语句子中although和though绝对不能和but出现在同一个句子中,但是可以和yet连用;故选C。
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