单项选择题
Techniques for ______ sleep would involve learning to control both mind and body so that sleep can occur.
A．pushing
B．cultivating
C．promoting
D．strengthening
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单项选择题
According to the periodic table, ______ still some elements undiscovered.
A．there seem to be
B．it seems to be
C．it seems that
D．here seem
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单项选择题
On no account ______ to anyone who works in the company.
A．my name must be mentioned
B．my name must mention
C．must my name be mentioned
D．must my name mention
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