A、 look
B、 to look
C、 looks
D、 looking
答案：D
A、 look
B、 to look
C、 looks
D、 looking
答案：D
A. enter
B. enters
C. entering
D. entered
解析：解析:wheh状语从句中的主语是第三人称单数,
A. of
B. on
C. to
D. by
解析：解析:sensitive to (对……敏感)
解析：试题解析:本题考查的知识点为连续函数在闭区间上的最大值.若f(x)在(a,b)内可导,在[a,b]上连续,常可以利用导数判定f(x)在[a,b]上的最值:
A. twenty-one
B. the twenty-one
C. twenty-first
D. the twenty-first
解析：解析:序数词前加the。
A. did you put…put
B. have you put…have put
C. had you put…was putting
D. had you put…have put
A. to bring
B. bringing
C. having brought
D. to have
解析：解析:brought
A. of which
B. which
C. of whom
D. who
A. ones
B. your
C. that one
D. that
解析：解析:furniture是不可数名词,
A. on
B. in
C. at
D. for
解析：解析:be on the telephone 接电话
A. 关于物质世界的普遍联系和永恒发展
B. 关于自然、社会和思维发展的一般规律
C. 关于社会存在和社会意识相互作用的规律
D. 关于理论和实践相互作用的规律
