单项选择题

He will pass two milestones ________, that is, he will receive his master's degree and find a challenging job.

A．long before
B．before long
C．a long long ago
D．long ago
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单项选择题
________ did Arthur realize that there was danger.
A．Upon entering the store
B．When he entered the store
C．After he had entered the store
D．Only after entering the store
单项选择题
The mixture of elements in the air can be thought ________ a solution of gases.
A．of as
B．of
C．as
D．of to
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