【題目】他為什么做這件事還不十分清楚。
wasn't quite clear.

【答案】Why he did it
【解析】空格處是主語(yǔ),why“為什么”引導(dǎo)主語(yǔ)從句,由下文使用了一般過(guò)去時(shí)可知從句用一般過(guò)去時(shí)。故填Why he did it。

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