life will continue on the earth for millions of years to come will depend on the problem of pollution can be solved.
| A．How /whether | B．That/that | C．Whether / if | D．Whether / whether |
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life will continue on the earth for millions of years to come will depend on the problem of pollution can be solved.
| A．How /whether | B．That/that | C．Whether / if | D．Whether / whether |
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