问题描述：
〓英语〓一道关于复合句的选择题〓小诺求助〓
We must improve the farming method _______ we may get high yields.
A.in order to
B.in order that
C.since
D.as
We must improve the farming method _______ we may get high yields.
A.in order to
B.in order that
C.since
D.as
问题解答：
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