题目内容
It is a good plan in theory, but it remains _______ whether it works in practice.
| A．seeing | B．to see | C．seen | D．to be seen |
D
解析试题分析：考查remain的用法：句意：这在理论上是个好计划，但是在实践中是否奏效还有待证实。Remain后面接不定式，表示“仍然要做…”，因为it和see是被动关系，用不定式的被动式，选D。
考点：考查remain的用法
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