语法与词汇
Outbreaks of diseases in trees commonly occur _____ stressed because of drought or other environmental factors.
A、
as forests that become
B、
in forests become
C、
that become forests
D、
when forests become
【正确答案】
D
【答案解析】
答案：D 分析：空格前句子已完整，空格处填状语，D为正确答案； A中多了that； 翻译参考：当森林受到因为干旱或是其它环境的因素的威胁时,树木的疾病就经常爆发。
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