The children ＿＿＿＿＿＿ very quiet； I wonder what they ＿＿＿＿up to.
#104649
A
were； are being
B
are being； are
C
are； do
D
are being； do
推荐题目
Although the Eiffel Tower ________ to last for 20 years, it is still standing today.
#99837
A
has designed
B
had designed
C
is designed
D
was designed
—Isn't it hard to drive downtown to work?—Yes，that's why I________to work by train.
#99169
A
have been going
B
have gone
C
was going
D
will have gone
---- The battery in my cell phone is running low. ---- I _____ that last night before we went to bed.
#101362
A
was noticing
B
have noticed
C
had noticed
D
would notice