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【单选题】
流过电感的电流( ),电感上的电压( )。A.
能跃变 不能跃变
B.
不 能跃变 能跃变
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举一反三
【单选题】—Hi, Tracy, you look tired. —I am tired. I ______ the living-room all day.
A.
painted
B.
have been painting
C.
had painted
D.
have painted
【单选题】—Hi, Winda, you look tired. —I am tired. I ______ the living-room all day.
A.
painted
B.
have been painting
C.
had painted
D.
have painted
【单选题】——Hi, Steve, you look tired. ——I am tired. I ______ the living room all the afternoon.
A.
painted
B.
had painted
C.
have been painting
D.
have painted
【单选题】Hi, Traly, you look tired. I’m tired. I the living room all day.
A.
painted
B.
had painted
C.
have been painting
D.
have painted
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