用适当形式填空:Students should be _____(ask) to study hard.

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用适当形式填空:Studentsshouldbe_____(ask)tostudyhard.用适当形式填空:Studentsshouldbe_____(ask)tostudyhard.用适当形式填空:

用适当形式填空:Students should be _____(ask) to study hard.
用适当形式填空:Students should be _____(ask) to study hard.

用适当形式填空:Students should be _____(ask) to study hard.
asked
be + 过去分词,表示被动.