_____ they are fit, I see no reason why they shouldn't go on playing basketball for another four or five years.
A．In case　　B．Provided thatC．UnlessD．As if
B

試題分析：A. In case以防，萬一，B. Provided that假如，條件是，C. Unless 除非，D. As if如果，句意：如果他們是健康的，我看不出他們?yōu)槭裁床粦?yīng)該再打四五年籃球。選B。
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