Though the key was pressed, nothing ______ on the screen.
A．a(chǎn)ppearedB．was appearedC．a(chǎn)ppearsD．is appeared
A
考查時(shí)態(tài)。句意：盡管按鍵了，但是屏幕上什么也沒(méi)出現(xiàn)。結(jié)合語(yǔ)境可知下文描述的是過(guò)去發(fā)生的動(dòng)作，故用一般過(guò)去時(shí)態(tài)，故選A
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