单项选择题

-How long are you staying
-I don't know．______．

[A] That's OK.
[B] Never mind.
[C] It depends.
[D] It doesn't matter.
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单项选择题
Although he has taken a lot of medicine, his health ______poor.
[A] proves
[B] remains
[C] maintains
[D] continues
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Selecting a mobile phone for personal use is not an easy task because technology ______so rapidly.
[A] is changing
[B] has changed
[C] changed
[D] will change
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