单项选择题

In countries where a solar calendar was adopted, the length of each year need to be ______ in order to have the same number of months in each year.

A．changed
B．altered
C．transformed
D．modified
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单项选择题
The farmers had to wear heavy boots in the winter because the fields were so wet and ______.
A．dusty
B．earthy
C．soiled
D．muddy
单项选择题
I ______ my teacher to write a reference letter to me if I see him.
A．have asked
B．ask
C．will ask
D．asked
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