单项选择题
Would you mind（）down and wait for a few more minutes？
A.sitting
B.to sit
C.to have sat
D.sit
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单项选择题
液氯与反应器间设置（）和缓冲罐。
A、截止阀
B、止回阀
C、蝶阀
D、球阀 -
单项选择题
At first（）I thought it was Mary，but when I looked again I saw it was Jane.
A.sight
B.look
C.watch
D.stare -
单项选择题
They were evidently trying to（）the public into obedience.
A.frighten
B.dwell
C.attract
D.make
