一Professor Li, ______the student start at once or wait a while?     
一At once.
A．willB．shallC．canD．may
B
考查情態(tài)動詞，shall在這里表示征求對方意見，句意：李教授。這位學(xué)生立刻開始還是等一會？立刻開始。所以選B。
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