I was impressed by the range of______ accessories of my microcomputer that were

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问题 I was impressed by the range of______ accessories of my microcomputer that were available.

选项 A、acceptable
B、compulsory
C、optional
D、random

答案 C

解析空白前面有range“范围”，那么“附件”应该是在范围内“选用的”，optional“可选择的”符合题意，故C正确。acceptable“可接受的”；compulsory“必须做的，必修的，被强迫的”；random“任意的，随意的”。

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Iwasimpressedbytherangeof______accessoriesofmymicrocomputerthatwere