Exactly______ the potato was introduced into Europe is uncertain, but it was probably around 1565.
#30010
A
whether
B
why
C
when
D
how
推荐题目
She understood what I was talking about, ____ it was the first time we had spoken together.
#30906
A
whether
B
as if
C
even if
D
Since
6. White-collar workers across China are becoming____ concerned about the impact of the global financial crisis on their careers.
#80134
A
highly
B
strictly
C
hardly
D
increasingly
The cousins are alike in age, but _____ they are as different as day and night.
#34782
A
anyhow
B
besides
C
otherwise
D
moreover
Mary was much kinder to Jack than she was to the others, , of course, made all the others upset.
#32932
A
who
B
which
C
what
D
that
______environmental damage is done，it takes many years for the ecosystem to recover.
#80690
A
Eyen if
B
If only
C
While
D
Once