单项选择题

His latest medical study suggests that high blood pressure ______ with unhealthy lifestyles.

A．has something to do
B．have something to do
C．had something to do
D．is having something to do
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The train from Shanghai is pulling ______.
A．in
B．out
C．off
D．back
单项选择题
I ______ you that these goods will be delivered to you tomorrow morning.
A．assure
B．ensure
C．insure
D．sure
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