10. The greenhouse effects occurs ____ heat radiated from the sun.
(A) when does the earth’s atmosphere trap
(B) does the earth’s atmosphere trap
(C) when the earth’s atmosphere traps
(D) the earth’s atmosphere trap
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統計: A(11), B(5), C(290), D(22), E(0) #572073
統計: A(11), B(5), C(290), D(22), E(0) #572073