Tony ________ full marks, but he was so careless as to make a spelling mistake.
A．could have gainedB．can have gained
C．must have gainedD．must gain
A

試題分析：句意：Tony本來(lái)可以得滿分的，但是他太粗心了，犯了一個(gè)拼寫(xiě)錯(cuò)誤。could have gained表示過(guò)去本來(lái)可以做的事而沒(méi)做；can have gained表示對(duì)過(guò)去情況的懷疑或不確定；must have gained表示對(duì)過(guò)去發(fā)生的事情或狀態(tài)進(jìn)行推測(cè)，選A。
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