单项选择题

The most serious block to concentration is the ______ which comes not from outside but from within.

A．intermission
B．involvement
C．interruption
D．intervention
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单项选择题
She had also expressed great anxiety as to who was to ______ her for the loss of her fences and crop.
A．compensate
B．supplement
C．diminish
D．compromise
单项选择题
Being already a graduate from another university, he was ______ from the entrance examination.
A．exempted
B．perished
C．prohibited
D．precluded
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