Nobody knows how people first came to these islands. They _____ from South America on rafts.
#87576
A
ust have sailed 
B
an sail 
C
ight have sailed
D
hould have sailed
推荐题目
The boss looked very worried and demanded that the work________before we went home.
#87293
A
wound be finished
B
was finished
C
must be finished
D
be finished
I didn’t see her in the meeting room this morning. She _____ at the meeting.
#90209
A
mustn’t have spoken
B
shouldn’t have spoken
C
needn’t have spoken
D
couldn’t have spoken