When the old man _______ to walk back to his house, the sun ________ itself behind the mountain.
#104495
A
started; had already hidden
B
had started; had already hidden
C
had started; was hiding
D
was starting; hid
推荐题目
 Various efforts over the centuries _________ to predict earthquakes to reduce the damage. 
#99978
A
are being made
B
have been made
C
were made
D
were being made
Although the Eiffel Tower ______ to last for 20 years, it is still standing today.
#100117
A
has designed
B
had designed
C
is designed
D
was designed
 No decision _____ about any new operations until we have discussed all the details. 
#101842
A
is made
B
is being made
C
has been made
D
will be made