试题来源:公共英语一级-213
【单选题】 These machines must ______ before they are used.
A.
[A] check |
B.
[B] be checked |
C.
[C] are checked |
参考答案:B
网考网解析:
仍然是考查被动语态,注意must 是情态动词,后面应接... 查看试题解析出处>>
试题来源:公共英语一级-213
【单选题】 These machines must ______ before they are used.
A.
[A] check |
[B] be checked |
[C] are checked |
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