In those days, we had no phones, so we have to keep in touch _________ writing often.
#28930
A
with
B
of
C
on
D
by
推荐题目
Scientists are convinced ________ the positive effect of laughter ________ physical and mental health.
#25675
A
of; at
B
on; at
C
by; in
D
of; on
“How could you lose so much money?”Charlie asked his wife, eyeing her angrily from the kitchen table.
#28151
A
at
B
across
C
through
D
on
We’ll have to race _____ the clock to complete the work on time.
#25645
A
beyond
B
over
C
from
D
against
To reach Africa, we flew high mountains, deep valleys and great deserts(沙漠).
#26301
A
on, across, though
B
over, through, through
C
over, through, across
D
on, in, across
______ giving up, he went on with his research,got his PhD and married the girl.
#28974
A
Without
B
Except
C
Instead of
D
But for