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单项选择题
A．Mary forgot about the seminar.B．Mary has been ill for several weeks.C．Mary wasn’t able to attend the seminar.D．Mary hadn’t planned to attend the seminar.
A．Mary forgot about the seminar.
B．Mary has been ill for several weeks.
C．Mary wasn’t able to attend the seminar.
D．Mary hadn’t planned to attend the seminar.
单项选择题
A．To carry information that would help determine elevation.B．To provide accurate weather reports.C．To relay information from scientists around the world.D．To indicate which route the mountain climbers should take.
A．To carry information that would help determine elevation.
B．To provide accurate weather reports.
C．To relay information from scientists around the world.
D．To indicate which route the mountain climbers should take.
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