单项选择题

______ at the launching position a lift took him up to the rocket, which was 65 feet above the ground.

A．While arriving
B．Having arrived
C．When he arrived
D．On his arrival
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单项选择题
A list of the semester's composition assignments ______ to the students.
A．has given
B．have given
C．has been given
D．have been given
单项选择题
That complicated scheme ______ a simple plan.
A．evolve from
B．evolve into
C．evolved from
D．evolved into
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