David was always ______ his best in any danger, but at that moment he froze.
#25229
A
at
B
in
C
for
D
on
推荐题目
The child was lost in the forest, where he was _____ the mercy of wild beasts.
#28224
A
in
B
on
C
for
D
at
Those who show respect for others will be respected ________.
#27307
A
in response
B
in return
C
in turn
D
in place.
The Great Wall travels______ deep valleys, _____ deserts and______ mountains.
#26210
A
over; across; through
B
through; across; over
C
across; over; through
D
through; across; across