1.It was not until December 31 __________ we heard from him.
A. which B. when C. that D. then
2.At one time we had about eighty people here who did nothing but __________into various family history.
A. researchedB. researchC. researchingD. to research
3.— How __________ will you be able to come back from you travel?
— In a couple of weeks, perhaps.
A. fast B. long C. often
4.Your hair needs __________. You’d better have it done tomorrow.
A. cut B. cutting C. to cut D. being cut
D. soon
5.When __________ to dinner at the White Rose Restaurant, he seemed very happy and accepted the invitation.
A. invited B. invitingC. to be invited D. having invited
1强调句。 itwas that 2nothing but do sth 3根据下面的回答可以知道对方是问去多久，所以要用How long ，How often是问多经常。一般回答是每隔多久才去一次Howfast是问速度的4 cut 可表被动态，need to be done /need doing 表被动你的头发需要把被怎样~~故选B便可5还原句子是When he having invited to dinner at the White Rose Restaurant, he seemed very happy and accepted the invitation.主语是he所以是正在被邀请故选having invit
1、C强调句2、Bnothing but do sth 也是词组的固定用法这里有两个例子，试比较： The enemy can do nothing but surrender敌人除了投降之外，别无出路 The enemy had nothing to choose but to surrender 3、Bhow long是对
1，c.是强调句型啊2，b.前面有个助动词（did）,后面就用原型3，a.如果选how long, 回答的应该是一个短时间，而不是一个表示时间的介词短语。如果是how often，回答的应该是表示频率的词，所以，，，4，b.need doing =need to be done5,a,此句前后主语一致，所以，从句中省略主谓，选INVITED
