—What has made John look like lacking sleep?
—________ he had to prepare for the coming exam and stayed up last night.
| A．For | B．Because |
| C．That | D．What |
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—What has made John look like lacking sleep?
—________ he had to prepare for the coming exam and stayed up last night.
| A．For | B．Because |
| C．That | D．What |
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