2. 考研
  3. Greater efforts to increase agricultural production must be made if food shortage ______ avoided.

Greater efforts to increase agricultural production must be made if food shortage ______ avoided.

admin2019-05-28  17
问题 Greater efforts to increase agricultural production must be made if food shortage ______ avoided.
选项 A、is to be
B、can be
C、will be
D、has been
答案A
解析 is to be表示应该，必须。
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