单项选择题

I was (so interested in) the video that I (watched) it (for) two hours before I (realized) it.

A. so interested in
B. watched
C. for
D. realized
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单项选择题
Only when (he realized) that there (would be) more (difficulties) ahead than he expected (he came to) me for help.
A. he realized
B. would be
C. difficulties
D. he came to
单项选择题
It is required by law that a husband (has to pay) the debts of his wife (until) formal notice is given (that) he no longer has to pay (her).
A. has to pay
B. until
C. that
D. her
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