题目列表(包括答案和解析)
Tom looked upon the test as an obstacle _____ his classmates regarded it as a challenge.
A.while B.because C.unless D.if
Mother was worried because little Alice was ill, especially ________ father was away in France.
[ ]
No one can attain great achievements ________ he concentrates on what he is doing, even though a talent.
A.because
B.while
C.unless
D.if
Tom looked upon the test as an obstacle ________ his classmates regarded it as a challenge.
A.while
B.because
C.unless
D.if
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