单项选择题

When I arrived home after a hard day at work, my wife（）

A．was sleeping
B．had been sleeping
C．slept
D．has been sleeping

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单项选择题
The manager of the company insisted that all the staff members（）the new safety rules.

A．would observe
B．observe
C．observed
D．will observe
单项选择题
（）he was an old customer, the boss allowed 5% discount off the prices of the goods.

A．Gave
B．To give that
C．Given that
D．Giving that
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