【題目】They plant ___________ trees on the mountain.

A.thousand ofB.thousands ofC.two thousandsD.two thousand of

【答案】B

【解析】

句意：他們在山上種了數(shù)以千計的樹。

考查名詞短語。“具體數(shù)字+hundred/thousand/million/billion”時數(shù)字單位不加s，但是當“hundred/thousand/million/billion”和of連用構(gòu)成“hundreds/thousands/millions/billions + of sth.”的結(jié)構(gòu)時，數(shù)字單位需加“s”， 結(jié)合選項，故選B。

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