He didn’t make _____ clear why he was late again.
A．itB．thatC．thisD．those
A
這題考查的是it做形式賓語(yǔ)，why引導(dǎo)的從句是真正的賓語(yǔ)從句，句意是：他沒(méi)有說(shuō)明他為什么又遲到了。選A。
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