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
Large quantities of water, as well as some other timely help including a medical team ___since the serious drought hit Yunnan Province.
#101955
A
has offered
B
had been offered
C
have been offered
D
is offered
If you _________ reading that book, take it back to the library.
#100473
A
have finished
B
will finish
C
finished
D
are finishing
The play had already been on for quite some time when we __________ at the New Theatre.
#104602
A
have arrived
B
arrived
C
had arrived
D
arrive
--- May I visit you at 10 o’clock tomorrow morning?--- I’m afraid I ______ a document for my boss then. What about 12:00?
#100864
A
am preparing
B
will have prepared
C
will be preparing
D
have been preparing