In order to do something meaningful, it’s necessary that you _______ determine what is really important.
A．mustB．willC．needD．should
D

試題分析：句意：為了做一些有意義的事情，你決定什么是真正重要的很必要。這里使用了句型：it’s necessary that+從句，從句中用should do表示虛擬語氣，should可以省略，所以選D。
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