Where is my passport? I remember _______ it here.
You shouldn't have left it here. Remember _______ it with you all the time.
A.to put;to take
B.putting;taking
C.putting;to take
D.to put;taking
第1题:
32. —Shall I tell Bob the news?
—No,you _________.I've told him already.
A. shouldn’t
B. wouldn’t
C. mustn’t
D. needn't
第2题:
—Where____you____lunch?
—Athome.Therewasnoschoollunch
A.did;have
B.are;having
C.will;have
D.do;have
第3题:
I_______ have watched that movie —it’ll give me horrible dreams.
A. shouldn’t
B. needn’t
C. couldn’t
D. mustn’t
第4题:
2、下列与关系代数的基本运算等价的元组关系演算表达式,表达不正确的是()。
A.RUS={t | R(t)∨S(t)}
B.R-S={t | R(t) ∧ S(t)}
C.σf(R) = { t | R(t) ∧ F}
D.πi1,i2,…,ik(R )={t(k)|(∃u)(R(u)∧t[1]=u[i1]∧...∧t[k]=u[ik])}
第5题:
A)ashouldn't eat
B)mustn't have eaten
C)shouldn't have eaten
D)mustn't eat
第6题:
If only we______(have)a phone! I'm tired of waiting outside the public phone box.
第7题:
第8题:
Where ________ you ________?
A.are/be
B.have/be
C.is/be
D.have/been
第9题:
I’d rather you ________ make any comment on the issue for the time being.
A) don’t B) wouldn’t C) didn’t D) shouldn’t
选C
would rather that……"宁愿……",that从句中用过去时表示现在或将来要做的事。
第10题:
下列与关系代数的基本运算等价的元组关系演算表达式,表达不正确的是()。
A.RUS={t | R(t)∨S(t)}
B.R-S={t | R(t) ∧ S(t)}
C.σf(R) = { t | R(t) ∧ F}
D.πi1,i2,…,ik(R )={t(k)|(∃u)(R(u)∧t[1]=u[i1]∧...∧t[k]=u[ik])}