_____there are many different types of food, some animals spend their lives eating only one type.
#30402
A
Since
B
As
C
Despite
D
While
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_________ we have been classmates for three years, she hasn’t left me much impression, so I can’t remember her after graduation.
#30157
A
Since
B
Although
C
Because
D
Unless
I think going swimming in my spare time, _____ I think is great fun and good exercise as well as a useful skill.
#34727
A
which
B
as
C
that
D
what
Exactly______ the potato was introduced into Europe is uncertain, but it was probably around 1565.
#30010
A
whether
B
why
C
when
D
how
She thought I was talking about her daughter in fact，I was talking with my daughter.
#30615
A
whom
B
where
C
which
D
while