几道有关动词时态的单选题~Theyoungmanwasoffenseen----bythelake.AtodrawBtodrawingCdrawDdrew\Doyoubelievetherearealiens?I’mafraidnot.Idon”tthinkaliens----inspace.AcanfindBcanbefoundCcanbefounded

Question

几道有关动词时态的单选题~
The young man was offen seen ---- by the lake.
A to draw B to drawing C draw D drew \
Do you believe there are aliens?
I’m afraid not.I don”t think aliens ---- in space.
A can find B can be found C can be founded D can”t be found
China”s sports stars Yao Ming and Liu Xiang ---- Goodwill Ambassadors for Shanghai.
A has been named B have been named C has named D have named
The Chinese mainland pandas,Tuan Tuan and Yuan Yuan ,---- to Taiwanon Dec.23,2008.
A sent B were sending C were sent
Liu Xiang ---- by his coach to train regularly.
A advised B advises C was advised D be advised
Long time no see!
I”ve just returned .I ---- to Zhengzhou for a meeting last month.
A am sent B was sent C am send ing D was sending
May we leave the classroom now?
No,you --- .You ---- to leave until the bel rings.
A must not are allowed B do not have to ,are supposed
C need not ,are not allowed D can not ,are not supposed
这几道题我不懂啊,求高人赐教、

Answer 1

A see sb do sth转成被动态要加to,be seen to do sth
B 原句可看成i think aliens cannot be found in space,think的宾语从句否定前置.
外星人被发现,用被动态.
B 两人被选为,被名为,用被动态
C 过去时间,用过去时.被送去,被动
C 刘翔常受到教练的建议指导,用被动态.其实这里如果有is advised的选项的话更加准确,regularly应该是用一般时更好.
D 我被派去郑州开会,被动态.上个月,过去时
D may作可能讲时,用can't 表否定；
may作可以讲时,用mustn't表绝对不
另外后半句是not...until的巨型.直到下课铃响你们才能离开.