We employ about seven hundred full-time people. But we（）causal staff when we need them.<br>A: check in<br>B: taken in<br>C: check out<br>D: take on

We employ about seven hundred full-time people. But we（）causal staff when we need them.
A: check in
B: taken in
C: check out
D: take on

出自：国家开放大学《商务英语(本科)》

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