________ on ten years of observation and study, Professor Wang announced that everyone dreams every night，whether they realize it or not.
#88276
A
Basing
B
Based
C
Been based
D
Having based
推荐题目
I remembered________ the door before I left the office but forgot to turn off the lights.
#89948
A
locking
B
having locked
C
to have locked
D
to lock
Most of the teachers ______ to visit our school were young ones.
#95272
A
invited
B
to invite
C
being invited
D
had been invited
What difficulty will you have _______ people when you stay in a foreign country?
#96648
A
understanding
B
understood
C
to understand
D
understand
I would like________to the party last night but I had to work extra hours to finish a report.
#88452
A
to go
B
to have gone
C
going
D
having gone
Lily’s mobile phone was left in a taxi accidentally, _____ again.
#90688
A
never to find
B
to never be found
C
to never find
D
never to be found