单项选择题

It was not until the sandstorms kept attacking north China that ______ how serious the problem was.

A. did the people realize
B. didn’t the people realize
C. the people realized
D. the people did realize
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单项选择题
—Your cell phone number again I ______ quite catch it. —It's 8677439.
A. don't
B. didn't
C. can't
D. couldn't
单项选择题
—I did enjoy myself at your party. —______.
A. It's a pleasure
B. Oh, I'm very glad to hear that
C. Oh, that's good news
D. Congratulations
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