问题

These problems, ________, will seriously affect the growth of teenagers and even the nation’s future.

A:not if solved properly
B:if solved properly
C:if not solved properly
D:not if properly solved

正确答案是：

同类题型

Last night, I called at ______. [ ]

Look! Somebody the sofa–Well, it wasn’t meI didn’t do it

_ human beings use it in a wrong way, like we did with nuclear technology, the advancement of science and technology has never led to decline of human development.

The furniture, with its modern style and bright colors, suits modern houses and their gardens, but looks ________ in the garden of a traditional home.[ ]

older generation used to advise usnot to build ____ in the air, but that’s not realistic at all.