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He thought a lot about____

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He thought a lot about____
A:how the crop to improve
B:how improved the crop
C:how to improve the crop
D:to how improve the crop
He thought a lot about____
选C.how to...是一个很常见的结构,意为“怎样能够...”
how to (improve the crop)=how he could (improve the crop).
这句话的意思是:他苦思冥想怎样能够提高收成.
类似的结构有:what to...=what can/could sb....
I don't know what to do to.=I don't know what I can do.