单项选择题

When taking a shower, please ______ that the shower curtain is inside the bath.

A．sure
B．ensure
C．insurance
D．ensue
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单项选择题
Do you often look out of the windows while you ______ lessons
A．have
B．had
C．are having
D．has
单项选择题
______ around our city, the foreigners were invited to have attend an evening party.
A．Have shown
B．Having been shown
C．Been shown
D．Being showing
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