24. Second engineer told me that you are __________ with the No.1 HFO Purifier.
(A) having problems
(B) have problems
(C) has problems
(D) had problems

答案:登入後查看
統計: A(659), B(278), C(61), D(108), E(0) #2105335

詳解 (共 1 筆)

#4574122
be動詞後要接動名詞be +Ving 
(共 21 字,隱藏中)
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