問題詳情:
改錯:By the time he realizes he walked into a trap, it'll be too late for him to do anything about it.
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【回答】
walked前加has 句意:在他意識到自己已經走進圈套時,對他來說,已無能為力了。根據句意可知用現在完成時。
知識點:現在完成時及其被動式
題型:短文改錯