单选题：The manager promised to keep me （　　）of how our business was

题目内容：

The manager promised to keep me （　　）of how our business was going on. A．to be informed
B．on informing
C．informed
D．informing

参考答案：

答案解析：

It was essential that the application forms （　　）back before

It was essential that the application forms （　　）back before the deadline (截止日期).

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