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
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单项选择题
______ he did, he would never give up.
A. Though hard
B. As hard
C. Hard if
D. Hard though
单项选择题
We shall call on her as soon ______.
A. as she comes
B. she comes
C. as she shall come
D. as she will come
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