为什么选that?
35.They didn’t discover until they happened to enter the back room ________ someone had stolen the priceless painting. A. that B. what C. which D. when 答案给的A，这个题为什么选that?
"That" is functioning as a subordinating conjunction in your sentence。 The subordinate clause "that someone had stolen the priceless painting" is also a noun clause which is the object of the verb "discover。
""What" and "when" can also be used as conjunctions, but they have different meanings。 "What" has the wrong meaning for your sentence and simply does not work; however, "when" could be used because the noun clause formed with "when" indicates the time someone had stolen the priceless painting。
That time could be discovered upon entering the back room。 This noun clause also acts as the object of the verb "discover。
"They didn't discover, until they happened to enter the back room, when someone had stolen the priceless painting。
Of course, using "when" completely changes the meaning of the sentence; therefore, it is important to understand which idea you are trying to convey in your sentence so that you use the proper conjunction。
that是名词子句的开头字。意思是到了后面的房间才发现“这件事”。 what, when, which都不合适，这与有几间房间是没有关系的。
what和when肯定不对，同时文中也没有表示出有很多房间的含义，所以which也不对。that，特指被偷走画作的房间
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