单项选择题

The new staff didn’t know how to use the system（）I explained it to him yesterday.

A. until
B. because
C. if
D. since

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单项选择题
（）is reported in the newspapers that the talks between the two companies have not made any progress.

A. That
B. What
C. It
D. As
填空题
What did customers complain in the survey It took ______ to settle their complaints.
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