问题
The data shows the situations of the world economy ________ careful observation and detailed studies.[ ]
A: in the name of
B: on the basis of
C: at the cost of
D: in charge of
B: on the basis of
C: at the cost of
D: in charge of
正确答案是：
同类题型
Be quick, ___________ we’ll be late for the meeting.
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Do you know where my key to the bike is, granny—I’m not sure. It be in your drawer.