问题
选择题
___ the help of his teacher, he has passed the English exam.
A．Under
B．In
C．Below
D．With
答案
答案：D
with the help of 意为：在…的帮助下.是固定搭配.
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___ the help of his teacher, he has passed the English exam.
A．Under
B．In
C．Below
D．With
答案：D
with the help of 意为：在…的帮助下.是固定搭配.
从阳离子混合液中充分分离。