单项选择题

Thank you for giving me a hand. I ______ in the experiment without your valuable help.

A．have failed
B．will fail
C．would have failed
D．must have failed
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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
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
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