2. 外语
  3. Listen to that laughter! They______themselves.

Listen to that laughter! They______themselves.

admin2013-11-24  20
问题 Listen to that laughter! They______themselves.
选项 A、must enjoy
B、must be enjoying
C、may be enjoying
D、can be enjoying
答案B
解析 must be doing sth．用于推断现在必定正在发生的事情。
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