题目内容：

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.researched B.research C.researching D.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.inviting C.to be invited D.having invited

优质解答

1强调句.it was 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How fast是问速度的4 cut 可表被动态,need to be done /need d...