We can’t take part in the competition ________ we get our student card.
A．beforeB．ifC．WhileD．a(chǎn)s
A
考察連詞。A.在……之前  B. 如果 C. 當(dāng)……時 D.由于。句意：在我們拿到學(xué)生卡之前，我們不能參加這場比賽。故選A。
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