用所给动词的适当形式填空They_____(see)the elephant several times.

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用所给动词的适当形式填空They_____(see)theelephantseveraltimes.用所给动词的适当形式填空They_____(see)theelephantseveraltimes.

用所给动词的适当形式填空They_____(see)the elephant several times.
用所给动词的适当形式填空They_____(see)the elephant several times.

用所给动词的适当形式填空They_____(see)the elephant several times.
have seen