单项选择题

Feel free to ______the engineer for more assistance.

A． call on
B． call to
C． call forward
D． call at
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单项选择题
Please refer to your personal ______number.
A． identify
B． identities
C． identification
D． identified
单项选择题
______ you transfer your account, sign on the dotted line.
A． While
B． Because
C． During
D． Before
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