So, ________ the government has a good system of control or can educate the people, the forests will slowly disappear.
| A．as long as | B．when | C．unless | D．every time |
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So, ________ the government has a good system of control or can educate the people, the forests will slowly disappear.
| A．as long as | B．when | C．unless | D．every time |
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