单项选择题

In__________drills, the students change a given structure in a way so that they are exposedto other similar structures, which also helps them have a deeper understandingof how the structures are formed and how they are used.

A. substitution
B. transformation
C. comprehension
D. communicative

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单项选择题

The visitors had made somuch__________that Mr Water had to spend several days cleaning up afterwards.

A. Trouble
B. disturbance
C. damage
D. mess

单项选择题

When any of the maxims under the Cooperative Principle is flouted on purpose,__________might arise.

A. ambiguous structure
B. contradictory proposition
C. mutual understanding
D. conversational implicature