2. 外语
  3. I don’t know______, but I’m loosing some plants each year, most of them during the winter months.

I don’t know______, but I’m loosing some plants each year, most of them during the winter months.

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问题 I don’t know______, but I’m loosing some plants each year, most of them during the winter months.
选项 A、what is this disease
B、what was this disease
C、what this disease was
D、what this disease is
答案D
解析 这句话的意思是说，我不知道这是什么病，但每年都会有些植物死亡，大部分都是在冬季的那几个月里。what引导的宾语从句要用陈述句语序,再综合考虑时态，应该用一般现在时，所以正确项是(D)。
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