( )Jack seldom fails in the english exam because he works____quickly hard slowly hardly

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( )Jack seldom fails in the english exam because he works____quickly hard slowly hardly
( )Jack seldom fails in the english exam because he works____
quickly hard slowly hardly

( )Jack seldom fails in the english exam because he works____quickly hard slowly hardly
B 努力

hard and effectively.

work hard努力学习。这里hard是副词
hardly 是几乎不的意思