问题描述：
They__ thankful to have the opportunity to further their studies.
A.would like to be
B.ought to be
C.would rather be
D.had better be
在各种语境下如何使用,
A.would like to be
B.ought to be
C.would rather be
D.had better be
在各种语境下如何使用,
问题解答：
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