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I'llcallyoutonightat10o'clockicanfindatelephonethatworksA.unlessB.supposeC.providedD.when选哪个?为什么?

题目详情
I'll call you tonight at 10 o'clock _____ i can find a telephone that works
A.unless
B.suppose
C.provided
D.when
选哪个?为什么?
▼优质解答
答案和解析
c
倘若