单项选择题

Only five years ago, there ______a shortage of computer specialists.

A． was
B． were
C． has been
D． have been
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单项选择题
The company offers a ______plan for its workers.
A． retirement
B． retiring
C． retire
D． retired
单项选择题
Management let the employees ______at two o'clock.
A． leave
B． left
C． was leaving
D． was left
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