-Could you give me an explanation ______ your keeping silent throughout thediscussion?---Oh,terribly sorry.I had the least idea of what ________.I would have made acomplete fool of myself if I had said anything.A.for; was discussed B.of; had discusse

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-Could you give me an explanation ______ your keeping silent throughout thediscussion?---Oh,terribly sorry.I had the least idea of what ________.I would have made acomplete fool of myself if I had said anything.A.for; was discussed B.of; had discusse

-Could you give me an explanation ______ your keeping silent throughout thediscussion?---Oh,terribly sorry.I had the least idea of what ________.I would have made acomplete fool of myself if I had said anything.A.for; was discussed B.of; had discusse
-Could you give me an explanation ______ your keeping silent throughout the
discussion?
---Oh,terribly sorry.I had the least idea of what ________.I would have made a
complete fool of myself if I had said anything.
A.for; was discussed B.of; had discussed C.to; was being discussed
D.with; had been discussed
为什么

-Could you give me an explanation ______ your keeping silent throughout thediscussion?---Oh,terribly sorry.I had the least idea of what ________.I would have made acomplete fool of myself if I had said anything.A.for; was discussed B.of; had discusse
问题是此前正在被讨论, 一下子就定位到C了

explain to解释 固定用法