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
— Have you finished your composition already?— Yes. I ______ it in twenty minutes.  
#104629
A
have finished
B
finished
C
will finish
D
had finished
Amy insists that she ____ the secret to lose weight. But she won’t share it with us.
#101092
A
had discovered
B
discovers
C
has discovered
D
will discover
—Ouch! You hurt me. —I’m sorry. But I _____ any harm. I _____ to drive a rat out.
#100219
A
don’t’ mean; am trying
B
didn’t mean; tried
C
haven’t meant; tried
D
didn’t mean; was trying