单项选择题


A．had to
B．should
C．might
D．must
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单项选择题
A．blendingB．associationsC．combinationsD．mixtures
A．blending
B．associations
C．combinations
D．mixtures
单项选择题
The U.S. and the EC officials now are ______ .
A．negotiating where to meet again
B．busy fixing the date to hold talks
C．doing their best to solve differences
D．arriving at a local trade agreement
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