The children ＿＿very quiet；I wonder what they ＿＿up to.
#104400
A
were； are being
B
are being；are
C
are；do
D
are being；do
推荐题目
The fire _______ before the fire-fighters arrived．
#103405
A
has been put out
B
was put out
C
had put out
D
had been put out
. Sales of CDs have greatly increased since the early 1990s, when people ________ to enjoy the advantages of this new technology.
#104797
A
begin
B
began
C
have begun
D
had begun
－Oh, it’s Julia, I her!－She’s just make her hair cut and she is a new dress.
#101550
A
don’t recognize; having on
B
didn’t recognize; wearing
C
haven’t know; putting on
D
didn’t know; dressing
---- How could I thank you enough? ----Don’t mention it. Any other man ________ that.
#102253
A
would
B
will do
C
would have done
D
had done