题目内容：

1.（C）Our monitor asked me _____.
A.to enter for what events B.what events to evter
C.what events to enter for D.what to enter for
2.(D)The twins must have passed their Chinese exam yesterday,_____?
a.haven't they B.needn' they
D.mustn't they D.didn't they
3.(D)Lily,do morning exercises with us,_____?
A.do you B.won't you C.will you D.A or C
4.(A)Are you sure_____they'll come _____ tomorrow?
A.if,/ B.whetherot not C.that,/ D.if,or not
5.(B)Let Helen do the job,_____.
A.if she does B.if she will
C.wherher she does D.if she like

优质解答

C ask for后面加名词或者名词短语,本处由what引导
D 昨天的事情,所以是didn't,这一点需要记住,所有过去的事情提问的时候只要不涉及当前都用一般过去时
D c是肯定的,解释见第五题.而因为本句是祈使句,所以反问也可以用do you,这一点需要记住
A or not连接的是并列的词语或者词组,所以明显BD不对,我感觉C也可以,实在给不出解释,抱歉.如果非要说为什么的话,可以说这个地方如果是sure的话,跟will有抵触,will是不怎么确定的事情.
B 祈使句虽然用的是现在时,可是要做的是即将发生的事情.if是假设,语气更加不确定,用将来时比较恰当.