单项选择题

People always shake hands and say "How do you do" when______to each other.

A. introduced

B. introducing
C. introduce

D. to be introducing
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单项选择题
______that no one was ever prepared for it.
A. So suddenly did the bad news come
B. So suddenly the bad news came
C. So did the bad news come suddenly
D. Did the bad news come so suddenly
单项选择题
______she realized it was too late to go home.
A. No sooner it grew dark than
B. Hardly did it grow dark that
C. Scarcely had it grown dark than
D. It was not until at dusk that
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