With the development of modern society, E-mail as well as telephones an important part in daily communication.
#100960
A
have played
B
is playing
C
are playing
D
had played
推荐题目
Without this year’s Nobel Prize in physics winner Charles Kao’s idea of fibrotic（光纤的）communications, the “modern” telephone and Internet _________impossible．
#103582
A
will be
B
were to be
C
should be
D
would be
China sent up Shenzhou Ⅸ manned spaceship into space successfully, which shows science and technology ______ rapidly in China.
#100611
A
have been developing
B
have developed
C
has been developed
D
is developing
Sales of CDs have greatly increased since the early 1990s, when people_____to enjoy the advantages of this new technology.
#104613
A
begin
B
began
C
have begun
D
had begun
---The window is dirty.----I know. It ______ for weeks.
#101155
A
hasn’t cleaned
B
didn’t clean
C
wasn’t cleaned
D
hasn’t been cleaned
I don't know what decisions ______ at the conference as John hasn't reported to me yet.
#104318
A
wouldmake
B
willmake
C
aremade
D
weremade