单选题 Yesterday's solutions are not always ______ to today's problems.
【正确答案】 D
【答案解析】解析:applicable(to)a.可应用的;生效的;适当的,台适的(如:This rule is not applicable to foreigners.Then new law is applicable from next Monday.)。favourable(to)a.有利的,顺利的;赞成的,称赞的。complementary(to)a.(互相)补足的;协调的。supplementary a.增补的,补充的。