单项选择题

When （）,ice will be changed into water, or even steam.

A.heated
B.heating
C.to heat
D.be heating

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Mr. Johnson preferred to （） heavier work to do, such as to wash the ears.

A.be given
B.be giving
C.have given
D.give
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I apologize if I （） you, but I assure you it was not on purpose.

A.offend
B.should have offended
C.had offended
D.might have offended
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