可以麻烦大家解释一下这几题吗
47 This kind of glasses manufactured by experienced craftsmen ____B_______ comfortably.
A) is worn B) wears
C) wearing D) are worn


56 Although many people view conflict as bad, conflict is sometimes useful ____C_______ it forces people to test the relative merits of their attitudes and behaviors.
A) by which B) to which
C) in that D) so that


59 The director was critical _____C__________ the way we were doing the work.
A) at B) in
C) of D) with


64 It is essential that these application forms _______D______ back as early as possible.
A) must be sent B) will be sent
C) are sent D) be sent


这些题目都是四级的考题。多谢大家讲解!

第一题选“waars”这个词比较特殊，可以用主动表示被动。

第二题选“in that"; "in that" 相当于“because".

第三题选“of","be critical of" 是固定搭配，表示“爱挑毛病的”。

第四题选“be sent", "It is essential taht+”虚拟，用动词原形。