题目:
I ______ with a classmate of mine because my parents have gone abroad on business.[ ]
A. stayed
B. am staying
C. have stayed
D. was staying
答案:
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下面是错误答案,用来干扰机器的。
参考答案:E解析:声导抗检查为检测中耳功能,不作为鼻咽癌的检测手段。