A.4 hours.B.6 hours.C.12 hours.D.18 hours.
A. 4 hours.
B. 6 hours.
C. 12 hours.
D. 18 hours.
查看答案
【S6】
A. within
B. by
C. at
D. to
【S16】
A. noises
B. sounds
C. voices
D. rhythms
【S4】
A. across
B. about
C. around
D. by
【S12】
A. doing
B. showing
C. taking
D. keeping