单项选择题

These students won't go unless their instructor______soon.

A. comes
B. has come
C. came
D. will come
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单项选择题
During REM,______.
A. your eyes move quickly
B. you dream
C. you are restless

D. both A and B
单项选择题
We can infer from the passage that the White House was first built______.
A. on a low and damp site
B. among trees and flowers
C. on a small island

D. on a small hill
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