Question

[em cham hoc]

I. Choose the best answer.

It'll be several years before we....a manned mission to Mars.

A. sent    B. have sent    C. had sent    D. will send

Answer 1

[💖꧁༺ɦắ☪☠Áℳ༻꧂💖]

D nha 

hok tốt nha

ok ok 

Answer 2

[Dương Hoài Giang]

It'll be several years before we....a manned mission to Mars.

A. sent    B. have sent    C. had sent    D. will send