- Was it because of his laziness_______ he didn't do the experiment successfully?
- No, it was because of his carelessness.
| A．that | B．while | C．for | D．as |
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- Was it because of his laziness_______ he didn't do the experiment successfully?
- No, it was because of his carelessness.
| A．that | B．while | C．for | D．as |
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