The fifth generation computers, with artificial intelligence, _____ and perfected now.
A.developed | B.have developed |
C.are being developed | D.will have been developed |
It suddenly occurred to me I hadn’t locked my door.
A.which | B.where | C.that | D.whether |
The result was not the same as they had expected, ______ was rather disappointing.
A.that | B.which | C.when | D.what |
London's road traffic map is like a cobweb(蜘蛛网) of small streets, offering drivers more _______ when one road is blocked.
A.barriers | B.characters | C.similarities | D.alternatives |
We need some more facts and figures ______ we make the final decision.
A.since | B.before | C.after | D.until |
Not until he went through real hardship _____ the love we have for our families is important.
A.had he realized | B.did he realize | C.he realized | D.he had realized |