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【单选题】
关于晶体管放大电路，以下说法不正确的是（ ）A.
晶体管放大电路有三种连接方式，即共基极、共发射极、共集电极连接
B.
晶体管放大电路只有既放大电压又放大电流，有放大作用
C.
集电极电阻RC的作用是将集电极电流的变化转换成电压的变化，实现电压放大
D.
要使晶体管具有放大作用，都必须使发射结正偏，集电结反偏
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【单选题】I don’t suppose Sabrina will agree, _______?
A.
do I
B.
don’t I
C.
will she
D.
won’t she
【单选题】Jenny is always absent from school, ______ I suppose is why she is criticized now and then.
A.
which
B.
who
C.
that
D.
what
【单选题】Jane didn't say_________she would return, but I suppose she'll be back for dinner.
A.
that when
B.
when
C.
if or not
D.
where
【单选题】My cousin Nancy is often in a poisonous mood I suppose it's because she is. _____ child.
A.
one
B.
a None
C.
a single
D.
an only
【单选题】As she’s not here, I suppose she _____ home.
A.
must go
B.
must have gone
C.
might go
D.
might be going
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