—Your sister’s plan is not quite practical.Why not try to persuade her to give it up?
—My sister is very stubborn，so it is________to try to change her mind.
A．by chanceB．in vain
C．on purposeD．for sure
B

句意為：——你妹妹的計劃不是很切合實際。為何不勸她放棄？——我妹妹很固執(zhí)，所以要她改變主意根本就是白費力氣。in vain意為“枉費心機，白費力氣”。by chance碰巧，湊巧；on purpose故意地；for sure毫無疑問。
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