—I wonder why the thinnest plastics bags, though ________ , are still in use here.—Well, it’s no easy job to solve this problem effectively.
#96104
A
banning
B
banned
C
to ban
D
having banned
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————.the website of www．google．com, and you will learn a lot about Obama’s first official visit to China．
#95757
A
Searching
B
To search
C
Having searched
D
Search
__________from what everyone says about him, I would say he has a good chance of winning.
#95521
A
To judge
B
Judging
C
Judged
D
Having judged
in the ticket hall for almost an hour, I suddenly realized I had left my ID card home.
#94251
A
To wait
B
To have waited
C
Waiting
D
Having waited
Robert is said______ abroad, but I do not know what country he studied in.
#98572
A
to have studied
B
to study
C
to be studying
D
to have been studying