单项选择题

A structurally independent unit that consists of a number of words to form a complete statement, question or command is called

A．a clause.
B．a phrase.
C．a sentence.
D．all of the above.
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单项选择题
According to Krashen, ______ refers to the gradual and subconscious development of L1 ability by using it naturally in daily communicative context.
A．acquisition
B．learning
C．competence
D．performance
单项选择题
______ is the American poet whose work was first recognized in England and then in Americ
A． Robert FrostB. Wallace StevensC. Walt WhitmanD. Emily Dickinson
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