单项选择题

The situation today is obviously different from（）it was about 30 years ago.

A．what
B．when
C．which
D．such

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单项选择题

（）he retired, Mr. Wang had worked in the factory for 30 years.

A．Whenever
B．By the time
C．The moment
D．Since

单项选择题

The manager of the company insisted that all the staff members（）to their offices at six the next morning.

A．came
B．would come
C．might come
D．come

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