单项选择题

Eagerly watching the child's learning of new skills ______.

A．should be avoided
B．is universal among parents
C．sets up dangerous states of worry in the child
D．will make him lose interest in learning new things

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单项选择题

The engineer claims that this engine is ______ as the previous one.

A．twice powerful
B．as twice powerful
C．powerful as twice
D．twice as powerful

单项选择题

It was not until the accident happened ______.

A．that I realized my carelessness
B．when I realized my carelessness
C．as I realized my carelessness
D．when my carelessness has been realized