【題目】—Mr. Smith, why are you still waiting here?

—Professor Black promised to attend the meeting, but he ____________(not appear).

【答案】hasn’t appeared

【解析】

句意：——史密斯先生，為什么你還在這里等？——布萊克教授答應參加會議，但是到現(xiàn)在還沒出現(xiàn)。

根據(jù)語境，史密斯先生等布萊克先生參加會議，but前后轉折，說明布萊克教授還沒出現(xiàn)。對現(xiàn)在有影響，現(xiàn)在完成時，結構為have/has done。主語是he，助動詞選擇has，否定是在后面加not，故答案為hasn’t appeared.

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