His ability ____ mathematics in a short time is wholly admirable.
A. not to work out
B. work out
C. to work out
D. working out
Conditional Sentence Type 1Superlative Degree (Adjective) Yes-No Question Linking WordsPresent Perfect TenseSynonym and AntonymPassive Voice Present SimpleConditional SentenceHelpful Phrases
Other quiz: Grammar
…. harder and harder to have a family in the city.
A. It gets
B. It’s getting
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