问题补充:
—Do you plant trees in spring, Mike?
—Yes. Many trees in our city every year.
A. plant
B. are planting
C. have planted
D. are planted
答案:
A. plant
B. are planting
C. have planted
(答案→)D. are planted
解析:句意:麦克,你春天植树吗?是的,每年我们的城市都会种植很多树。为“每年我们城市都要栽很多树”。此句为一般现在时的被动语态。