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【单选题】
-- Why do you look so worried ? -- My MacBook Pro broke down and my paper _____ unfinished ever since.A.
left
B.
was left
C.
has been left
D.
has left
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反馈参考答案：
举一反三
【单选题】下列各组物质可能共存的是( )。
A.
C u2+，Fe2+，Sn4+，Ag
B.
Cu2+， Fe， Fe2+，Ag +
C.
Cu2+，Fe 3 +， Fe ，Ag
D.
F e3 +，Fe2+，Sn4+， I-
【单选题】—Why does she always ask you for help? —There's no one else she can _____, is there? [ ]
A.
refer to
B.
make use of
C.
care about
D.
turn to
【单选题】下列各组物质可能共存的是( )
A.
Cu 2+ 、Fe 2+ 、Sn 2+ 、Ag;
B.
Cu 2+ 、Ag 2+ 、Fe 2+ 、Fe;
C.
Cu 2+ 、Ag 2+ 、Fe 3+ 、Fe;
D.
Sn 2+ 、I - 、Fe 3+ 、Fe 2+ 。
【单选题】—Why does she always ask you for help?
A.
here is no one else _______, is there?
B.
who to turn to
C.
she can turn to
D.
for whom to turn
E.
for her to turn
【单选题】Why does she always drive to work ________ she could easily take the bus?A．whileB．even ifC．whenD
A.
14. Why does she always drive to work ________ she could easily take the bus? A．while
B.
even if
C.
when
D.
Though
【单选题】下列各组物质可能共存的是 ( )
A.
Cu 2+ ,Fe 3+ ,Sn 4+ ,Ag
B.
Cu 2+ ,Fe 2+ ,Fe,Ag +
C.
Cu 2+ ,Fe,Fe 3 + ,Ag
D.
I - ,Fe 3+ ,Sn 4+ ,Fe 2+
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