I ___ on this project for days without success.
a. have been worked
b. have been working
c. had being worked
Relative Pronoun Simple Present Tense Principal vs. Principle Grammar of Conjunctions and PrepotitionsPassive SentencesSimple Present and Present Continuous TenseMixed ConditionalsSimple present/ past/ future tensePresent Simple
Other quiz: Grammar
What are the FANBOYS ?
A. for , as , nice , before , of , yet , see
B. for , and , nor , but , or , yet , so
C. finaly , amp , no ,but , original , so
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