题目内容

Though the key was pressed, nothing ______ on the screen.
A．appearedB．was appearedC．appearsD．is appeared
A
考查时态。句意：尽管按键了，但是屏幕上什么也没出现。结合语境可知下文描述的是过去发生的动作，故用一般过去时态，故选A
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