【題目】In 1620, about half the USA forests.

A. was covered B. covered with

C. were filled with D. was covered with

【答案】D

【解析】考查被動語態(tài)和句意理解。句意：1920年，美國一半的土地都被樹林覆蓋。cover sth. with sth意為“用……覆蓋……”。about half the USA和cover之間是被動關(guān)系，故該句應(yīng)用被動語態(tài)，故D選項正確。

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