.
We will learn how to operate the machine _______.
A．a(chǎn)t a time B．a(chǎn)t one timeC．a(chǎn)t the timeD．in time
D
考查短語辨析。at a time每次，at one time 曾經(jīng)，in time 及時(shí)，準(zhǔn)時(shí)，句意：我們將學(xué)會(huì)如何準(zhǔn)時(shí)操作機(jī)器。所以選D。
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