With the help of high technology, more and more substances _________ in the past years.
#101033
A
discovered
B
have discovered
C
had been discovered
D
have been discovered
推荐题目
It __________ me that she just expects me to help, but I had so many things to do today.
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A
annoys
B
surprises
C
excites
D
delights
It is recommended that the project ________ until all the preparations have been made.
#103598
A
is not started
B
will not be started
C
not be started
D
is not to be started
The famous musician, as well as his students, to perform at the opening ceremony of the 2012 Taipei Flower Expo.
#99340
A
were invited
B
was invited
C
have been invited
D
has been invited
Great changes___ have taken place _____ in the city, and a lot of factories________.
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A
have been taken place; have been set up
B
have taken place; have been set up
C
have taken place; have set up
D
were taken place; were set up
The 29th Olympic Games ____ in Beijing in 2008.
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A
will be held
B
was held
C
has been held
D
is being held