She tried to smile weakly,but the smile died( )it reached the comer of her mouth.

admin2014-02-25  59

问题 She tried to smile weakly,but the smile died( )it reached the comer of her mouth.

选项 A、after
B、when
C、before
D、while

答案C

解析 该句的句意为她努力想笑,但是没有笑出来。所以答案选C。
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