Did you know why an apple ________ down and not up?

[　　]

A．falls
B．falling
C．fall
D．falled
答案：A
解析：

讀完題后，就能判斷出這題表示一種普遍自然現(xiàn)象，應(yīng)用一般現(xiàn)在時(shí)。


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