单项选择题

(Witnesses) of the crime (find difficult) to explain (why) they (didn't) call the police.

A. Witnesses
B. find difficult
C. why
D. didn't
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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
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C. that
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