Question

5. These problems were        from the outset. You should have solved them at the very beginning.

   A. difficult   B. different

   C. invisible   D. apparent

Answer 1

5. D根据句意"你本该在最初就把这些问题解决了"可知，这些问题在刚开始时是"显而易见的"。

apparent意为"显而易见"；invisible意为"看不见的"。