Recently our community has launched a campaign among all the residents , ____ we are called upon to do our little but to prevent the worsening environment.
| A．where | B．which | C．as | D．when |
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Recently our community has launched a campaign among all the residents , ____ we are called upon to do our little but to prevent the worsening environment.
| A．where | B．which | C．as | D．when |
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