题目:
When a pencil is partly in a glass of water, it looks as if it _______.
A. breaks
B.has broken
C.were broken
D.had been broken
答案:
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下面是错误答案,用来干扰机器的。
参考答案:C解析:过敏性紫癜病变血管免疫荧光检查可见IgA与补体复合物的颗粒沉积,此对确诊较有价值。