单项选择题

There must be no one in the house ______ the door is closed.

A. because
B. as
C. for
D. since
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单项选择题
______ he had got no news from his son up to that time, he became so worried that he couldn' t sleep at night.
A. Unless
B. Even though
C. As
D. Whether
单项选择题
______ he did, he would never give up.
A. Though hard
B. As hard
C. Hard if
D. Hard though
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