单项选择题

Listen! His family must be quarrelling, ______

A. mustn't it



B. isn't it
C. aren't they


D. needn't they
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单项选择题
Syntax is the study of______.
A. language functions

B. sentence structures
C. textual organization

D. word formation
单项选择题
One day Chuck is on a flight () the Pacific Ocean suddenly () his plane crashed.

A. through while
B. through when
C. across when
D. across while
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