单项选择题

If you have never planted anything, you won‘t be able to know the pleasure of watching the thing you have planted _____.

A．grow
B．to grow
C．growing
D．to be growing
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单项选择题
Living in the desert involves a lot of problems, _____ water shortage is the worst.
A．not to mention
B．of which
C．let alone
D．for what
单项选择题
If the law and order _____, neither the citizen nor his property is safe.
A．are not preserved
B．have not been preserved
C．were not preserved
D．is not preserved
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