问题

Cold ______ the night air was, he slept soundly because he was so tired after working for a whole day.
A:although
B:while
C:however
D:as;
B:while
C:however
D:as;
正确答案是:
同类题型
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____ good-bye to uncle Li when you leave. [ ]
Heturned down the request of his friend because it wasthe limit of his power