The boys followed the marks that they ________, until finally they found their way back to the campsite.
#100125
A
left
B
have left
C
had left
D
have been left
推荐题目
--Hi, Tracy, you look tired. --I am tired. I________ the living-room all day.
#104239
A
painted
B
have been painting
C
had painted
D
have painted
It________heavily for 2 weeks and the farmers were very worried.
#99683
A
has been raining 
B
had been raining
C
has rained
D
had been rained
Look at the timetable. Hurry up!  Flight 4026  ____off at 18:
#104001
A
takes
B
took
C
will be taken
D
has taken