2. 外语
  3. It is (necessary) that she (comes) here twice a week (to help) (do) the housework.

It is (necessary) that she (comes) here twice a week (to help) (do) the housework.

admin2008-11-13  41
问题 It is (necessary) that she (comes) here twice a week (to help) (do) the housework.
选项 A、necessary
B、comes
C、to help
D、do
答案B
解析 应改为come。虚拟语气，用动词原形。
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