There’s no doubt enough concern must be paid to the problem of the stay­at­home ch

There’s no doubt enough concern must be paid to the problem of the stay­at­home children.
A. which
B. whether
C. that
D. what

A. whichB. whether(答案→)C. thatD. what解析：句意：这是没有疑问的， 关于留守儿童的问题必须给与足够的关注。固定句式There’s no doubt that…毫无疑问的是…… There’s doubt whether……怀疑是否……因此C正确。考点: 考查固定句式的用法辨析。

我也是这个答案