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。
外星宏仿册人被发现，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 我被派去郑大猜州开会，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的巨蔽宏型。直到下课铃响你们才能离开。