单选题
Container-grown plants can be planted at any time of the year, but ________in winter.
A、
should be
B、
would be
C、
preferred
D、
preferably
【正确答案】
D
【答案解析】
词义辨析。should be/would be应是;preferred首选的(adj.);preferably更适宜,最好是(adv.);因此应填D。
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