The problem remains the rescue teams could arrive in time. A、if B、whether C、when D、that

Question

选什么呢？

Answer 1

你好。
1 答案是whether. 这是表语从句，不是同位语从句，remains (==still is )在这里是系动词。whether是从句部分的连接词，解释为“是否”。
2 IF 在这里怎麼都是错的。
3 如果是C的话，就去掉 in time .
4 如果选D，主句部分应该是否定形式，比如说：There is NO problem THAT the rescue teams can / will arrive in time.
5 这是同位语从句：They are worried about the problem whether the rescue teams can arrive in time.

Answer 2

原题应为: The problem remains _______ the rescue teams could arrive in time.
答案: B、whether 是否
whether the rescue teams could arrive in time.是The problem 的同位语从句,
同位语从句只能用whether 引导,不能用引导,这是that语法规则.
句意: 救援队能否及时到达,这仍是一个问题.