单项选择题

it is generally thought that as teachers work with students, psychology course work is ______ to teacher-training.

A．indispensable
B．inviolate
C．indisposed
D．invariable
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单项选择题
The assassin hid himself carefully from view before ______ his future victim.
A．drawing from
B．drawing up
C．drawing with
D．drawing on
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