单项选择题

Mother insisted that______.

A. they are to be back before nine in the evening
B. they ought to be back before nine in the evening
C. they be back before nine in the evening
D. they had to be back before nine in the evening

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问答题

According to him, women are better liars than men.

单项选择题

Some African people once drank animal urine______.

A．when they were going to die
B．because they were thirsty
C．because there was little salt
D．because they were short of water