Robert is said          abroad, but I don’t know in which country he is.
#98083
A
have been studying
B
to have been studying
C
have studied
D
to have studied
推荐题目
It is no use       without taking any measures.
#89736
A
cry
B
crying
C
to cry
D
cried
_______ from the moon, our earth, with water _______seventy percent of its surface, appears a blue ball
#94101
A
Seen; covered
B
Seeing; covering
C
Seen; covering
D
Seeing; covered
Are you good at                 ?
#95477
A
swim
B
swimming
C
to swim
D
swam