Nobody _ever _to Mars before as the journey is too ...

Nobody _ever _to Mars before as the journey is too long and unsafe.

A. has travel

B. has travelled

C. had travel

D. had travelled

Select your answer:

Other quiz:

Tenses › View

She had worked for 10 different enterprises before she ______ her own company.

A. established

B. is establishing

C. had established

D. was establishing

Verb Tenses › View

I have ? (to read) that book before.

A. readen

B. red

C. readed

D. read