经济行为的有效批准文件包括：（）.
A.公司批文
B.政府（或上级单位）批文、董事会决议、股东会决议、经济协等
C.公司请示
D.股东会决议
参考答案：B
It was very late, but the teachers were ________ working hard in the office.
A．almost
B．already
C．still
D．ever
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