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【单选题】
一个良好的喷射系统必须能够保证具有良好的()。A.
喷油定时
B.
循环喷油量
C.
喷射质量
D.
喷油定时、循环喷油量和喷射质量
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【简答题】Many people have learned a foreign language in their own country; others have learned a foreign language in the country in which it is spoken. Which is better? Give the advantages of each and support ...
【单选题】because they _12_
A.
have not learned to write
B.
have learned to write
C.
had learned how to write
D.
had not learned to write
【单选题】Some of the students have already learned enough English to ________ a conversation with a native English speaker. [ ]
A.
carry on
B.
keep on
C.
go on
D.
hold on
【单选题】We ____five English songs by the end of last term. A had learned B learned C have learned D will have learned
A.
had learned B learned C have learned D will have learned
B.
learned C have learned D will have learned
C.
have learned D will have learned
D.
will have learned
【简答题】Some of the students havealready learned enough English to ____ a conversation with a native Englishspeaker. A. holdon B. keep on C. goon D. carry on
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