单项选择题

Human beings are superior to animals that they can use language as a tool of communication.()

A．in that
B．in which
C．for that
D．for which

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单项选择题
By the time of 1969, there were many space explorations.()

A．have been
B．must be
C．had been
D．must have been
单项选择题
Whenever we hear of a natural disaster, we feel sympathetic to the people to be affected.()

A．to have affected
B．to have effected
C．who have been effected
D．who have been affected
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