单项选择题

"Where is your farther"
"He _________ flowers in the garden."

A．waters
B．must water
C．must be watering
D．must have watered
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单项选择题
John has to prepare the mathematic examination _________.
A．he can as best
B．best as he can
C．as he can best
D．as best he can
单项选择题
A．inB．onC．atD．to
A．in
B．on
C．at
D．to
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