单项选择题

The new staff didn't know how to use the computer ______ I explained it to him yesterday.

A) until
B) because
C) if
D) since
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单项选择题
Effective measures must be taken to limit the number of tourists．
A) 对旅游者的数量必须采取有效的限制措施。
B) 应该采取有效的措施来约束大部分旅游者。
C) 我们必须采取有效的措施把大多数的旅游者限制起来。
D) 许多的旅游者因为我们有效的措施约束起来。
单项选择题
The professor raised his voice. He's afraid he can't make himself ______.
A) to be heard
B) heard
C) be heard
D) hearing
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