- when can l see the doctor madam - let me see sorry you -- your turn so you'll have to wait againa\ are missingb\ have missedc\ will missd\ missed请您说明理由好吗?

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-whencanlseethedoctormadam-letmeseesorryyou--yourturnsoyou''llhavetowaitagaina\aremissingb\havemissed

- when can l see the doctor madam - let me see sorry you -- your turn so you'll have to wait againa\ are missingb\ have missedc\ will missd\ missed请您说明理由好吗?
- when can l see the doctor madam - let me see sorry you -- your turn so you'll have to wait again
a\ are missing
b\ have missed
c\ will miss
d\ missed
请您说明理由好吗?

- when can l see the doctor madam - let me see sorry you -- your turn so you'll have to wait againa\ are missingb\ have missedc\ will missd\ missed请您说明理由好吗?
当出现since加一段时间加ago,over the last few days/years/months,since加某一点时间等等时间状语使用现在完成时,当已经发生的动作或事情对现在产生了影响,也用现在完成式,这里符合第二种,在等一次是结果,是错过了机会产生的影响,所以选B,题目中交代了才能用哦!

b 你已经错过了机会,所以请再等一次……

选a,直觉