单项选择题

The vice-president and production director of the company _______ the welcoming ceremony held by the Capital Hill this evening.

A．is to attend
B．are to attend
C．were to attend
D．have attended
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He's always ready to take ______ heavy responsibilities.
A．on
B．to
C．in
D．after
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We had to _______ into the ground to find water.
A．dig deeply
B．dig deep
C．deeply dig
D．deep dig
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