----- Have you heard of Earth Day ?
----Yes . The first Earth Day ______ in 1970 to educate us to protect our planet .
| A．celebrates | B．celebrated | C．is celebrated | D．was celebrated |
----- Have you heard of Earth Day ?
----Yes . The first Earth Day ______ in 1970 to educate us to protect our planet .
| A．celebrates | B．celebrated | C．is celebrated | D．was celebrated |
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