The aurora borealis______as a soft glow along the northern horizon if the base o

游客2025-02-04 23

问题 The aurora borealis______as a soft glow along the northern horizon if the base of its arc is beneath the horizon.

选项 A、which appears
B、may appear
C、appeared
D、would have appeared

答案 B

解析 In this present real conditional sentence, may appear is the correct verb form in the result clause.

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