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— How long have you known John?
— Since he ______ to our class.
A．has comeB．cameC．had comeD．comes
B

試題分析：考查時態(tài)。根據第一句中的have known說明是從過去某個時間到現在，故since后面使用過去時。句意：—你認識John多久時間了。—自從他來到我們班級。故B正確。
點評：時態(tài)的考查要住關鍵詞和上下文的語義。根據第一句中的have known說明是從過去某個時間到現在，故since后面使用過去時。
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