---Could you tell us ______?

---In two days.

A．how long will he come back

B．how long he will come back

C．how soon will he come back

D．how soon he will come back

某自动变速器作失速试验，测得失速转速为2900～3100r/min，说明这个变速器（）。

A.性能基本正常

B.液力变矩器锁止离合器损坏

C.制动带或离合器出现打滑

D.导轮单向离合器有故障