50.As rare as something becomes,be it a baseball card or a musical recording or a postage stamp,the more avidly it is sought by collectors
d.The rarer something becomes,like
e.The rarer something becomes,whether it is
答案的解释是whether is is X1 or X2 or X3是举例的一种表示方法.有这种方法吗?
Whether结构在这里应该是作为同位语来补充举例sth.的
即使作举例解,like代替such as举例是GMAT的一种经典错误,看到的第一眼就可以排除掉的那种
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