问题
选择题
Bobbie is always sick and weak his brother Frank is a good football player, as strong as a horse.
A．when
B．as
C．while
D．though
答案
答案：C
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Bobbie is always sick and weak his brother Frank is a good football player, as strong as a horse.
A．when
B．as
C．while
D．though
答案：C