Question

【题目】— 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

Answer 1

【答案】C
【解析】句意：---我发现很难学好物理。——这是真的。没有人能学好它，除非他刻苦学习。A. if如果，是否；B. because因为；C. unless除非，如果不。结合句意可知选C。