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

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

admin2019-07-01  29
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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