______remains doubtful_______ this is an important discovery.
问题描述：
______remains doubtful_______ this is an important discovery.
A.it began B.did it begin C.was it beginning D.is has began
选什么,为什么?
对不起，选项打错了。
A.That,whether B.That.that C.It,whether D.It,that
答
(It) remains doubtful (whether) this is an important discovery.
这是否会是一项重大发现人们对其仍持怀疑态度.
从句义看,应该是这样选的,其实,许多东西就是你的感觉,读多了,自然就知道怎样选了
其它的在上下文都不连贯