____ life will continue on the earth for millions of years to come will depend on _____ this problem can be solved.
A.That; whether | B.If; how | C.Whether; whether | D.If; if |
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____ life will continue on the earth for millions of years to come will depend on _____ this problem can be solved.
A.That; whether | B.If; how | C.Whether; whether | D.If; if |