单项选择题

Eliza remembers everything exactly as if it ______ yesterday.

A．was happening
B．happens
C．has happened
D．happened
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单项选择题
Before the drug is used on human beings, experts have to ______ dogs.
A．be experimented
B．experiment
C．experiment with
D．experiment on
单项选择题
Please remind me ______ be said he was going. I may be in time to see him off.
A．where
B．when
C．how
D．what
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