----- Have you heard of Earth Day ?----Yes . The first Earth Day ______ in 1970 to educate us to protect our planet .
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A
celebrates
B
celebrated
C
is celebrated
D
was celebrated
推荐题目
I love my hometown and I _______ here for 15 years.
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A
was living
B
live
C
will live
D
have lived
The interviewer asked Detective Lu where the murder ___________.
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A
was taken place
B
had taken place
C
had been taken place
D
took place
—Have you mended your shoes, Bob？—Yes, I _________ them twenty minutes ago ．
#36664
A
have mended
B
mend
C
had mended
D
mended