It’s nearly 7 o’clock. Helen _______ come, but let’s wait for her for another 5 to 7 minutes.
A．couldn’tB．can’tC．mustn’tD．may not
D
考查情態(tài)動詞。句意“將近7點了。海倫可能不會來了，但是讓我們再等她5-7分鐘吧。”A“不可能”；B“不可能”；C“禁止”；D“可能不”，語氣沒有can’t強，根據(jù)句意可知，應(yīng)該表示不太肯定的語氣。故選D。
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