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【单选题】
若平面向量 a =（1，-2）与 b 的夹角是180°，且 | b |=3 5 ，则 b 等于（ ）A.
（-6，3）
B.
（3，-6）
C.
（6，-3）
D.
（-3，6）
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【单选题】When I talked with my grandma on the phone,she sounded weak,but by the time we up, her voice had been full of life. [ ]
A.
were hanging
B.
had hung
C.
hung
D.
would hang
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A.
re-establishment
B.
restoration
C.
reproduction
D.
reparation
【单选题】Everything he ________ away from him before he returned to China.
A.
took
B.
had been taken
C.
had had been taken
D.
had taken
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