单项选择题

It seems water______from this tap for some time. We'll have to take it apart to put it right.

A. had leaked
B. is leaking
C. leaked

D. has been leaking
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单项选择题
Austin和Searle的理论是任务型教学语研究一个十分重要的理论来源。Searle认为，语言交际单位不是单词或句子等语言单位，而是______。
A．语言行为
B．言语行为
C．文字符号
D．心理表征
单项选择题
The experiment has（）the possibility of the existence of any life on that planet, but it does not mean there is no life on other planets.

A.found out
B.pointed out
C.ruled out
D.carried out
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