单项选择题

He must not allow this unusual barrier to stop him from fighting against the enemy.

A．interior
B．obstacle
C．interruption
D．interference
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单项选择题
Should either of these situations occur, wrong control actions might be taken and a potential accident sequence initiated.
A．imported
B．installed
C．started
D．interviewed
单项选择题
Next semester, Susan must take three compulsory courses.
A．formal
B．voluntary
C．practical
D．required
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