单项选择题

A) but C) because
B) though D) if

A．but
B．though
C．because
D．if
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单项选择题
A) after C) since B) until D) for
A．after
B．until
C．since
D．for
单项选择题
A) made C) investigated B) invented D) produced
A．made
B．invented
C．investigated
D．produced
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