People _________ rivers for transportation since the beginning of history.
#36687
A
used
B
have used
C
use
D
had used
推荐题目
—— What’s she doing for vacation?——She’s _____ Beijing.
#41914
A
visiting
B
visits
C
visiting
D
is visiting
Great changes______ in the city since1970.
#37282
A
have been taken place
B
have taken place.
C
has taken place
D
took place
—Where have you _________ all day? —I came back at noon and I _________ in this room ever since.
#40192
A
gone; had been
B
gone; was
C
been; have been
D
been; am
Shirley ______ a book about Tibet last year, but I don’t know whether she has finished it.
#63712
A
has written
B
wrote
C
had written
D
was writing