It is essential that these application forms ______ back as early as possible.
A．must be sentB．will be sentC．a(chǎn)re sentD．be sent
D
考查虛擬語(yǔ)氣。 It is essential that + 從句，從句用should + V原形的虛擬語(yǔ)氣，should可以省略，選D。
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