单项选择题

During volcanic ______, dark clouds of smoke fill the sky, bringing fears to local residents.

A．eruption
B．ejection
C．erosion
D．erection
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单项选择题
Improving the English ______ of graduate students is actually a demanding undertaking.
A．sufficiency
B．proficiency
C．deficiency
D．efficiency
单项选择题
Only when you have accumulated enough credits will you be ______ to apply for the degree.
A．elementary
B．ethnic
C．eligible
D．elegant
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