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單項(xiàng)選擇題

When I was a child, I used （） to the river and bathe in the evening.

A．to going
B．to go
C．go
D．going

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單項(xiàng)選擇題

As far as the professor （）, college students should get into the habit of studying by themselves.

A．concern
B．concerns
C．concerned
D．is concerned

單項(xiàng)選擇題

Ryan was late for the conference yesterday （） the traffic jam.

A．because
B．since
C．for
D．because of