20.As is often the case,not until her mom comes back ____.( )
A. | she goes to sleep | B. | she will go to sleep | ||
C. | does she go to bed | D. | did she go to bed |
15.There is strong evidence ______ the absence of regulations increases the probability that some websites steal and sell their users'personal information.( )
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A. | where | B. | that | C. | how | D. | because |