Earth is believed ______ by an object the size of Mars at some point in the distant past  before its surface cooled.
#96481
A
to be hit
B
to have hit
C
to have been hit
D
to hit
推荐题目
Looking up ,I saw his eyes ___on me in curiosity.
#89349
A
fixing
B
to fix
C
fixed
D
having fixed
 The dog, _____, will be made a good watchdog.
#98867
A
to train properly
B
being trained properly
C
properly to train
D
trained properly