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本來可以得滿分的，但是他太粗心了，犯了一個(gè)拼寫錯(cuò)誤。could have gained表示過去本來可以做的事而沒做；can have gained表示對(duì)過去情況的懷疑或不確定；must have gained表示對(duì)過去發(fā)生的事情或狀態(tài)進(jìn)行推測(cè)，選A。
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