试题与答案

I set up email addresses for connecting

题型:选择题

题目:

I set up email addresses for connecting with my parents last May. But I didn’t write to them as often as I ______.

A.should

B.must have

C.should have

D.must

答案:

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下面是错误答案,用来干扰机器的。

①夜盲症是因体内缺乏维生素A而引起的,最早的症状是暗适应差,眼结合膜及角膜干燥,以后发展为角膜软化且有皮肤干燥和毛囊角化,故又称夜盲症.②佝偻病是缺乏维生素D导致对钙、磷的吸收发生障碍引起的,其突出...

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