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
单项选择题
What does the woman have to do to get her computer replaced（）

A. To show the receipt.
B. To call the store first.
C. To pay some more money.
D. To bring the instruction manual.
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