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问题: 为什么选这个答案?

What caused the fire and how much the loss____still unknowm.
A. was are B. is were C.was is D.was was
为什么选A呢?

解答:

"what caused the fire" 和 "how much the loss was" 是两件过去发生的事情。这两件事情的答案目前(现在)都是未知,still就是“尚未”的意思。所以:They *are* unknown.

其他答案都说不通。