If you sit in a chair _____a long time, your back may begin to hurt.
A．a(chǎn)tB．inC．onD．for
D
本題考查介詞。介詞for 用來(lái)引導(dǎo)一段時(shí)間。句意：如果你坐椅子很長(zhǎng)時(shí)間，你的背部可能開(kāi)始受傷。
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