we need to have some practice( ) our theory.A .on which to base B .to base C.to baseD.on that to base 为什么选A!

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we need to have some practice( ) our theory.A .on which to base B .to base C.to baseD.on that to base 为什么选A!
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we need to have some practice( ) our theory.A .on which to base B .to base C.to baseD.on that to base 为什么选A!
we need to have some practice( ) our theory.A .on which to base B .to base C.to base
D.on that to base 为什么选A!

we need to have some practice( ) our theory.A .on which to base B .to base C.to baseD.on that to base 为什么选A!
A
base on 固定搭配,在这里是介词前置了.

选A
定语从句中,当介词放在That之前时,That就要变成相应的Which或Who等等。