Some aspects of a pilot’s job _______ be boring,and pilots often _______ work at inconvenient hours.
A．can; have toB．may; have to?
C．have to; mayD．ought to; must?
A?
句意為“做一個(gè)宇航員某些方面可能很乏味，而且他們常常不得不在很不適宜的時(shí)候工作”。第一空表示在某種情況下“可能會(huì)”，用can; 第二空表示客觀情況下“必須”，用have to。
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