Space exploration began in the 1960s, and since then about five hundred people into space.
#101989
A
have traveled
B
traveled
C
had traveled
D
are traveling
推荐题目
---I hear you ______ abroad. ---That’s right. We’re going to live in Spain．
#101291
A
are moving
B
have moved
C
move
D
will have moved
I ____ Mr. White at that time, otherwise I wouldn’t have asked you for some information about him.
#101527
A
hadn’t known
B
don’t know
C
didn’t know
D
haven’t known
I know a little bit about the city as I __________ there for one year in my youth.
#102511
A
am studying
B
had studied
C
studied
D
have studied
He was unhappy when he sold his guitar. After all, he ______ it for a long time..
#99795
A
had had
B
has had
C
has
D
had
--- Tommy is planning to buy a car. --- I know. By next month, he enough for a used one.
#102435
A
saves
B
saved
C
will save
D
will have saved