单项选择题

It was ______ he lost his mobile phone that he didn't call you back.

A．for
B．as
C．because
D．since
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单项选择题
Do you mind my ______
A．open the window
B．that open the window
C．opening the window
D．to open the window
单项选择题
There ______ my teacher and my classmates.
A．are
B．have
C．be
D．is
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