问题
选择题
They can surely overcome those difficulties ___ they are closely united.
A．even if
B．as long as
C．so long as
D．B and C
答案
答案：D
as long as，so long as（只要），是引导状语从句的连词，表示条件。
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They can surely overcome those difficulties ___ they are closely united.
A．even if
B．as long as
C．so long as
D．B and C
答案：D
as long as，so long as（只要），是引导状语从句的连词，表示条件。