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If you are weak _____ a subject, ______ and asking a teacher for advice can help.

If you are weak _____ a subject, ______ and asking a teacher for advice can help.

A．a(chǎn)t; working hard                        B．in; work hard

C．a(chǎn)t; work hard                          D．in; working hard

If you are weak ____a subject, ______and asking a teacher for advice can help.

A．a(chǎn)t; working                              B．in; work hard   

C．a(chǎn)t; work hard                                  D．in; working hard