单选题
Mary found it (difficult) to talk (calmly) about (which) she had (experienced) at the station.
A、
difficult
B、
calmly
C、
which
D、
experienced
【正确答案】
C
【答案解析】
[解析] 应改为what。what引导宾语从句，并在宾语从句中做宾语。
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