单项选择题

Had you followed the doctor's advice, you would be much better now. But you ______.

A．don't
B．haven't
C．hadn't
D．didn't
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单项选择题
Among the 15-year-old children, some ______ be studying in university while others are still learning to read and write.
A．should
B．would
C．can
D．must
单项选择题
The wild flowers looked like a soft orange blanket ______ the desert.
A．covering
B．covered
C．cover
D．to cover
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