17) There are many problems ______ for our help and many people who could profit from our efforts.
(A) wait
(B) to wait
(C) waited
(D) waiting

答案：登入後查看
統計： A(6), B(8), C(9), D(40), E(0) #1613608

詳解 (共 1 筆)

#4125000
此句已有動詞，故選waiting
(共 18 字，隱藏中）
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