_________anyone call, please ask them to call back later. ...

★ Conditional Sentences and Verb Form

_________anyone call, please ask them to call back later.

A. If

B. Should

C. When

D. Unless

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If I learnt Belarusian, I would read a Belarusian book.

A. I were learning to Belarusian, I could read a Belarusian book.

B. Were I to learn Belarusian, I would read a Belarusian book.

C. Were I learning to Belarusian, I would have read a Belarusian book.

D. Had I learnt Belarusian, I would have read a Belarusian book.