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
Nearly three months had gone by _________ the seriously injured girl showed a slight sign of recovery.
#30635
A
until
B
before
C
since
D
after
.It will not be ________ we can meet again.
#33845
A
long before
B
before long
C
soon after
D
shortly after