2. 外语
  3. Experts suggest that all computers be checked______to protect important files and programs.

Experts suggest that all computers be checked______to protect important files and programs.

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问题 Experts suggest that all computers be checked______to protect important files and programs.
选项 A、period
B、periodic
C、periodically
D、periodical
答案C
解析 单词形态：副词1．空格前出现了被动语态。动词变为被动语态时后面可接副词。因此副词(C)periodically为正确选项。2．you should check all computers periodically改为被动语态时，应为all computers should bechecked periodically。that前suggest是表建议的动词，因而should应省略。
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