In recent years, a number of communication satellites ______ into orbit about the earth.A.
In recent years, a number of communication satellites ______ into orbit about the earth.
A.have been put
B.has been put
C.are already put
D.have been putting
In recent years, a number of communication satellites ______ into orbit about the earth.
A.have been put
B.has been put
C.are already put
D.have been putting
第1题
A.compound word
B.derivation
C.adverb
D.conjunction
第2题
In recent years, computer are being made ______.
A.smaller and cheaper
B.larger and more expensive
C.more difficult to use
D.to work more slowly
第3题
The milder winters of recent years make the pine beetle population ______.
A.decrease
B.increase
C.keep in check
D.change
第4题
A.tender
B.obstinate
C.delicious
D.artificial
第5题
In recent years, those who invest in stocks are ______.
A.only rich people and big corporations
B.celebrities and powerful corporations
C.corporations as well as ordinary people
D.rich people, ordinary people and corporations
第6题
A.items
B.disciplines
C.conferences
D.projects
第7题
A.facilities
B.appliances
C.instruments
D.equipment
第9题
A.substantial
B.substance
C.submit
D.subjective