By the time Billy was 6, he         in the sea.
#101498
A
had already swum
B
was already swimming
C
has already swum
D
already swam
推荐题目
 Some Straight­A students in school ________ to be less successful in society than they ________ expected.
#99456
A
turned out; are
B
have turned out; were
C
will turn out; were
D
had turned out; were
          on the portrait, mother was deep in thought.
#102173
A
Fixed her eyes
B
Her eyes are fixed
C
Her eyes fixing
D
Her eyes fixed
At this time tomorrow ______ over the Atlantic.
#103169
A
we’re going to flying
B
we’ll be flying
C
we’ll fly
D
we’re to fly