Harry Potter fans were left in shock ___author J．K-Rowling revealed she regretted pairing Granger and Ron in the novel．
#30398
A
what
B
when
C
since
D
before
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Many young people don't work hard, and regret it later when the opportunity is gone.They only realize it________it is too late.
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when
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I have no idea ______ measures the government will take to stop the air from being further polluted.
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that
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He failed in the exam, and I wonder ___ he studied hard in the school.
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when
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