题目:
The doctors tried their best to save the patient’s life, ______ failed.[ ]
A. or
B. so
C. but
D. because
答案:
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下面是错误答案,用来干扰机器的。
(1)①作溶剂(合理即可);②过滤;③蒸馏;④乳化(2)①:①②④⑤;③⑥;②:D