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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单项选择题
Which of these trains is the one ______ goes to Nanjing
A．which
B．of which
C．of these
D．that
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单项选择题
He had gone away on business and would not return to the hotel until the next day. I should have to wait till ______ I could thank him for the present.
A．afterwards
B．then before
C．then
D．then therefore
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