单项选择题

As teachers we should concern ourselves with what is said, not what we think______.

A．ought to be said
B．must say
C．have to be said
D．need to say
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单项选择题
A．They protested against detaining boat people.B．They protested against letting them stay forever.C．They urged Vietnam to accept the boat people.D．They urged Britain to accept the boat people.
A．They protested against detaining boat people.
B．They protested against letting them stay forever.
C．They urged Vietnam to accept the boat people.
D．They urged Britain to accept the boat people.
单项选择题
Because fuel supplies are finite and many people are wasteful, we will have to install_______ solar heating device in our home.
A．some type of
B．some types of a
C．some type of a
D．some types of
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