单项选择题

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

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

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单项选择题

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

A．be given
B．have given
C．be giving
D．give

单项选择题

No bread eaten by man is so sweet as （） earned by his own labor.

A．that
B．such
C．one
D．what

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