Question

The task _______ by the time you come back.

A．has been completed

B．will have been completed

C．will complete

D．has completed

Answer 1

B

此題考查時(shí)間狀語(yǔ)從句。by the time+一般現(xiàn)在時(shí)態(tài)，主句應(yīng)用將來(lái)完成時(shí)態(tài)，by the time+一般過(guò)去時(shí)態(tài)，主句應(yīng)用過(guò)去完成時(shí)態(tài)，題中by the time后面是一般現(xiàn)在時(shí)態(tài)you come back，故選B，若掌握by the time的用法，就不難了。