If the letter (to be mailed) was placed on the (writing) table an hour (ago), it is certain (will be) there now.

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问题 If the letter (to be mailed) was placed on the (writing) table an hour (ago), it is certain (will be) there now.

选项 A、to be mailed
B、writing
C、ago
D、will be

答案D

解析 此句为虚拟语气,考点在于be certain to do sth.。应将Will be改为to be。
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