Bythetimeherealizeshe

問題詳情：

By the time he realizes he ________into a trap, it'll be too late for him to do anything about it.

A．walks                   B．walked

C．has walked               D．had walked

【回答】

C　[由句中realizes及it'll be可知應用現在的時態，故排除B、D兩項，由句意可知空白處強調已經完成的動作，故用現在完成時。]

知識點：現在完成時及其被動式

題型：選擇題