【題目】Why are you still waiting here?

Doctor Li promised to attend the meeting, but he __________ (not appear).

【答案】hasn't appeared

【解析】

句意:——你為什么還在這里等? ——李醫(yī)生答應(yīng)參加會議,但他沒有出現(xiàn)。

此處表示李醫(yī)生答應(yīng)參加會議,但是目前還沒來,對現(xiàn)在有影響,因此用現(xiàn)在完成時,其結(jié)構(gòu)是:助動詞have/has+動詞的過去分詞。主語he是單數(shù),因此用has,has not=hasn’t。故答案為:hasn't appeared

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