高中英语语法题,答案只有ABCD ,求详解,越祥越好~3Q

高中英语语法题,答案只有ABCD ,求详解,越祥越好~3Q
1.(C)The problem __ at present has something important to do with our living conditions.
A.discuss B.to be discussing C.being discussed D.to discuss
2.(B)The first thing that probably needs ___ is to ask your mother's advice .
A.to do B.to be done C.being done D.be done
3.(C)...What has made her so sad ...___ in the physics examination.
A.Failed B.Since she failed C.Failing D.Because of failing
4.(A)____,a man who expresses himself effectively is sure to succeed more rapidly than a man whose command of language is poor .
A.Other things being equal B.Other things were equal C.To be equal to other things
D.Other things to be equal
5.(A)All things____ .theplanned trip will have to be called off .
A.considered B.being considered C.considering D.to be considered
6.(A)The man in the corner confessed to _______a lie to the manager of the company.
A.having told B.be told C.being told D.have told
7.(A)Mikeused to look hurt and surprised when ______.
A.scolded B.scolding C.to scold D.having scolded
8.(A)The pressure _______ causes Americans to be energetic,but it dose put them under a constant emotional strain.
A.to compete B.competing C.to be competed D.having competed
9.(D)The professor could hardly find sufficient grounds ______ his arguments in favor of the new theory .
A.to be based on B.to base on C.whith to base on D.on which to base
10.(C)The project ______ by the end of 2000,will expand the city's telephone network to cover 1,000,000users.
A.completed B.being completed C.to be completed D.having been completed
11.(B)The result of the election was ont made _____ until last Friday .
A.knowing B.known C.to know D.to be known
12.(B)Mary is poor girl,I've been meaning _______her on .
A.to suggest to keep B.to suggest keeping C.suggesting to keep D.suggesting keeping