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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Our company ______ Metro Messenger Service since 1998.
A． use
B． used
C． had used
D． has been using
单项选择题
The solution cannot be determined _____the problem is identified.
A． if
B． when
C． until
D． which
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