单项选择题

______ receiving the gift, Dr. Roach sent me a thank-you card.

A. Since
B. On
C. For
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______ some of this juice perhaps you’ll like it.
A. Try
B. Trying
C. To try
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Don’t speak to him. He ______ to the weather report.
A. listens
B. is listening
C. has listened
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