单项选择题

The trading company requires that payment ______ on time.

A．is made
B．was made
C．make
D．be made
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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
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
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