单项选择题

(It is) (extremely) important (for) an engineer (to know) to use a computer.

A．It is
B．extremely
C．for
D．to know
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单项选择题
(Even) a professional psychologist may have difficulty talking (calm) and logically (about) (his own) problems.
A．Even
B．calm
C．about
D．his own
单项选择题
The retired president was very angry ______ even by the cooks.
A．to be ignored
B．to have been ignored
C．to having been ignored
D．to have ignored
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