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问题

Scientists say it may be five or six years ______ it is possible to test this medicine on human patients.

A:before
B:after
C:since
D:when
正确答案是:
标签: may , say , scientists
同类题型

Don’t worry. I’ll give this book to Jack as soon as he back.

Listen! Is it Linda singing in the next room? –No, it __________ be her. She is still in Shanghai.

What do you think of _______teacher? –She’s very kind. She can teach ______English well.

All of us have the desire to visit the three main temples in Athens, especially _______ contains a gold and ivory statue of Athena.

Mr. Zhang said that he would be punctual for the appointment, _______ he were late?

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