单项选择题

We see lighting (before we hear) the thunder (because) sound travels (more slowly) than (light is).()

A. before we hear
B. because
C. more slowly
D. light is

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When I was (at) the grocery store, I (realized) that the prices of (many items)(had been() risen).

A. at
B. realized
C. many items
D. had been risen
单项选择题
(Rarely) (we have seen) such an effective actor (as he) has proven himself (to be).()

A. Rarely
B. we have seen
C. as he
D. to be
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