问题补充:
Whether life will continue on the earth for millions of years will depend on this problem can be solved.
A. to come; if
B. coming; if
C. to come; whether
D. coming; whether
答案:
A. to come; if
B. coming; if
(答案→)C. to come; whether
D. coming; whether
解析:可联系答.案.网客服索取。