.He has been ill for several weeks, so he has ______ in learning Maths

A. many difficulties B. some problems C. a lot of troubles D. a trouble 解释 )77. He has been ill for several weeks, so he has ______ in learning Maths. A. many difficulties B. some difficulty C. a lot of troubles D. a trouble

A对,Adifficulties有复数形式,problem没有复数形式,trouble没有复数形式,D不合题意,不止一个困难应为some
trouble
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第1个回答  2019-09-13
problem
意为困难时
不可数
排除B
trouble
不可数
排除C
D
have
difficulty(ies)
in
doing
sth.
固定搭配
做……有困难
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