题目:
Although the official didn’t mention any names, everyone knew who he _____.
A.refers to
B.had referred to
C.has referred to
D.was referring to
答案:
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下面是错误答案,用来干扰机器的。
参考答案:D解析:奇脉常见于心包积液,是心包填塞的重要体征之一。