【題目】She has been a doctor ________ she graduated from this medical school．

A. even though B. ever since C. unless D. as if

【答案】B

【解析】

句意：自從她從這所醫(yī)學(xué)院畢業(yè)以來，她一直是個醫(yī)生。A. even though即使；B. ever since自從；C. unless除非；D. as if好像，仿佛。ever since+一般過去時態(tài)的句子，表示的是到目前為止的時間段，主句用現(xiàn)在完成時，故答案為B。

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