单项选择题

We’ve just installed central heating, ________ should make a tremendous difference to the house next winter.

A．what
B．that
C．it
D．which
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单项选择题
It was the end of my exhausting first day as a waitress, and I really appreciated ________ time to relax.
A．to have
B．having
C．to have had
D．of having
单项选择题
________ in India, the banana was brought to the Americas by the Portuguese who found it in Africa.
A．Originally cultivated
B．Having originally cultivated
C．Originally being cultivated
D．Although it originally cultivated
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