单项选择题

During times of war or economic ______ many people convert their wealth into precious stones, which are transportable and more easily sold.

A．distraction
B．disturbance
C．tremor
D．vibration
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单项选择题
However, as the evidence began to ______ experts from the Zoo felt obliged to investigate.
A．accumulate
B．amass
C．assemble
D．congregate
单项选择题
______ before we depart the day after tomorrow, we should have a wonderful party.
A．Were they to arrive
B．Would they arrive
C．Were they arriving
D．Had they arrived
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