问题
选择题
His writing is so confusing that it's difficult to make out _____ it is he is trying to express. [ ]
A. that
B. how
C. who
D. what
答案
答案：D
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His writing is so confusing that it's difficult to make out _____ it is he is trying to express. [ ]
A. that
B. how
C. who
D. what
答案：D