It's necessary that measures _____ at once to help people understand global warming is
affecting our life to an increasingly high degree.
| A．must be taken | B．be taken | C．should take | D．are taken |
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It's necessary that measures _____ at once to help people understand global warming is
affecting our life to an increasingly high degree.
| A．must be taken | B．be taken | C．should take | D．are taken |
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