---Look! Such heavy traffic!--- I doubt _________ or not I can get to school on time.
#56179
A
if
B
when
C
whether
D
why
推荐题目
_________ people were watching the sky, the alien got out of the UFO.
#57263
A
If
B
When
C
Because
D
While
—Can you guess if they ________tomorrow? —They will come if they ________free, I think.
#56039
A
come; will be
B
will come; will be
C
come; are
D
will come; are
We had to wait half an hour we had already booked(预定) a table.
#56455
A
since
B
although
C
until
D
before