单项选择题


A．that
B．which
C．where
D．when
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单项选择题
A．ingredientsB．elementsC．componentsD．factors
A．ingredients
B．elements
C．components
D．factors
单项选择题
A．fortunatelyB．fluentlyC．frequentlyD．frankly
A．fortunately
B．fluently
C．frequently
D．frankly
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