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【单选题】
斜切面韧皮部有树脂状分泌物呈红棕色至黑棕色，与木质部相间排列呈3～8个偏心性半圆形环的药材是A.
B.
钩藤
C.
大血藤
D.
鸡血藤
E.
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【单选题】We will inform our customers ____ the arrival of the shipment ourselves.
A.
by
B.
for
C.
of
D.
in
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A.
正确
B.
错误
【简答题】We will inform our customers ____________ arrival of the shipment ourselves.
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