A、 can't
B、 musn't
C、 needn't
D、 shouldn't
答案:C
A、 can't
B、 musn't
C、 needn't
D、 shouldn't
答案:C
A. thankful
B. more thankful
C. most thankful
D. less thankful
A. 0
B. 1
C. 2
D. 3
A. voice
B. taste
C. shape
D. sound
A. π
B. 2π
C. π/2
D. π/4
A. is
B. was
C. are
D. were
A. hopefully
B. suddenly
C. usually
D. luckily
A. careless
B. stupid
C. honest
D. humorous
A. save
B. saving
C. saved
D. to save
A. 2π
B. π
C. π/2
D. π/4
A. 0
B. 1
C. -1
D. 不存在