Much progress ________in telecommunications during World War I, but the basic technique________in the previous decades.
A. was achieved – had been developed
B. has been achieved – were developed
C. had been achieved – has been developed
D. would have been achieved – were developing
Random Topics:
Prepositions of TimeGerund or to InfinitiveVocabularyPresent Perfect and Past Simpleanother/the others/each other/one anotherTenses & AffixesVerbal PhrasesPassivisationComplex SentencesParts of Speech and GrammarOther quiz:
Grammar › ViewWhat is the joining of two or more together?
A. resolve
B. union
C. convention
D. representatives
Parts of Speech › View
Although she gave hundreds of zucchini away, the enormous mound left over frightened her.
A. conjunction
B. verb
C. noun
D. pronoun
Conjunctions › ViewThis is the man ____________ had a car accident yesterday.
A. where
B. who
C. and
D. then
Past Simple & Past Continuous › View
This morning I saw Judy while she ______ her bike around the lake and ______ photos of some of the rarest birds in the world.
A. was riding/was taking
B. rode/took
C. was riding/took
D. rode/was taking