单项选择题

Michael might have come to school in time for Professor Browning's lecture ______. ( )

A．if he got up earlier
B．unless he had got up earlier
C．but he had gotten up so late
D．but he got up rather late
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单项选择题
All of the plants now raised on farms, have been developed from plants ______ wild. ( )
A．once they grew
B．they grew once
C．that once grew
D．once grew
单项选择题
This book will show you ______ can be used in other contexts. ( )
A．how you have observed
B．how what you have observed
C．that you have observed
D．how that you have observed
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