问题补充:
Millions of treeson March 12th last year.
A. are planted
B. were planted
C. was planted
D. is planted
答案:
A. are planted
(答案→)B. were planted
C. was planted
D. is planted
解析:考查被动语态, 根据last year确定时态为一般过去时态,其次根据trees确定出be动词的单复数。“去年的3月12日数以百万计的树木被种植。”
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