单项选择题

He was busy writing the essay all the morning, only ______occasionally to have a cup of tea.

A．breaking off
B．breaking out
C．breaking
D．breaking away
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单项选择题
Nepal is a country in central Asia that is landlocked and______ by the Himalayas.
A．secluded
B．bordered
C．integrated
D．opened
单项选择题
Beth could______ her coat easily because it has large red buttons.
A．justify
B．identify
C．prove
D．test
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