This is certainly the case, but ____ it is a mistake or not I don’t know. 
#73119
A
if
B
even though
C
whether
D
that
推荐题目
   –Do you know _______?--- Someone wants to find his dog back.
#70398
A
what the notice says
B
what the notice writes
C
what is the notice written
D
what does the notice say
--- Whom shall I give the document?--- To ______ is in the office. However, ______ to require a written paper for it.
#71492
A
whom; make sure
B
who; make sure
C
whomever; be sure
D
whoever; be sure