【題目】— I find it difficult to learn Physics well.
— That's true. Nobody can learn it well _______ he works hard at it.
A.if
B.because
C.unless

【答案】C
【解析】句意:---我發(fā)現(xiàn)很難學(xué)好物理!@是真的。沒有人能學(xué)好它,除非他刻苦學(xué)習(xí)。A. if如果,是否;B. because因?yàn);C. unless除非,如果不。結(jié)合句意可知選C。

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