Sally has been swimming ______ four hours.
#50710
A
for about
B
since
C
about
D
/
推荐题目
I’m not going to buy _______ clothes ________ Sunday afternoon.
#48253
A
some; on
B
some; in
C
any; on
D
any; in
Our Earth will be ________ if we go on cutting down millions of trees every year.
#46202
A
in great danger
B
danger
C
dangerously
D
out of danger
