21、Bill is only three years old. He is ________ go to school.

A．too old to                                                B．not old enough to

C．not young enough                                     D．so old to

21、B

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Bill is only three years old. He is ________ go to school.

A．too old to                                                B．not old enough to

C．not young enough                                     D．so old to

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